add the equations 4x - y = -3
+ 5x + y = 21

Please help!!

Answers

Answer 1

The result of the addition of the two equations will be:

x = 2y = 11

Addition of simultaneous equations

Equation 1:   4x - y = -3

Equation 2:  5x + y = 21

Adding equations 1 and 2: (4x + 5x) + (-y+y) = (-3+21)

This then gives us: 9x + 0 = 18

To finish up the solution:

9x = 18

 x = 18/9

    = 2

Now, let's substitute the value of x into either of the 2 equations in order to obtain the value of y. Let's use equation 1:

4(2) - y = -3

8 - y = -3

   - y = -3 - 8

    - y = -11

      y = 11

In other words, adding the 2 equations will give us the value of x as 2 while the value of y would be 11.

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Related Questions

What is the predicted precipitation for the area where Salem, OR is located? (What colors?)

Answers

The predicted precipitation for the Salem, OR, area is mixed precipitation, as shown in purple and as shown in the second option, and on the map, different geographical areas are shown.

What is the importance of the map?

The map is important as it explains the different regions of the earth and their climate, geographic behavior, etc. and gives an idea of population, animals, plants, and human behavior. Depending upon the map, the biodiversity, the rain pattern, etc. are seen.

Hence, the predicted precipitation for the Salem, OR, area is mixed precipitation, as shown in purple and as shown in the second option, and on the map, different geographical areas are shown.

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in a group of 500 people, the frequency of genotype nn is 40%. assuming both autosomal inheritance and that the population is in hardy-weinberg equilibrium, how many individuals would you expect to have the mn genotype?
a. 68
b. 232
c. 200
d. 258

Answers

in a group of 500 people, the frequency of genotype nn is 40%. assuming both autosomal inheritance and that the population is in hardy-weinberg equilibrium, 232  individuals would you expect to have the mn genotype.

What is genotype ?

A genotype is heritable genes passes from parents to offspring; These genes involve in encoding specific features and the characteristics can be physically expressed in an organism called as phenotype.

The genotypes of the gene can be present in three form on the basis of allele arrangement such as homozygous dominant (PP), Heterozygous (Pp) and Homozygous recessive (pp).

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Which of the following correctly describes the members of the foraminiferans and radiolarians?
a) They can live in either fresh or saltwater.
b) They do not divide by mitosis.
c)They secrete shells.

Answers

Foraminiferans and radiolarians secrete shells option 'C'

what is Foraminiferans?

Foraminifera are seen as an  amoeba-like, single-celled protists (very simple micro-organisms) with shells or tests which inhabit the photic zone often live symbiotically with photosynthesizing orgasm like algae.

What is radiolarians?

The Radiolaria, also referred as Radiozoa, are protozoa like of  single-celled protistan marine organisms of diameter 0.1–0.2 mm that produce intricate mineral skeletons, typically with a central capsule and they are holoplanktonic protozoa and form part of the zooplankton basically dwell in open-ocean locations

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the study of the distribution of plants and animals, the diverse spatial patterns they create, and the physical and biological processes that produce earth's species richness is called

Answers

The study of the distribution of plants and animals, the diverse spatial patterns they create, and the physical and biological processes that produce earth's species richness is called Biogeography.

Species are the lowermost level of classification in the hierarchy of classification of organisms. It consists of similar type of organisms that occupy the same habitat and require same resources. The most important criteria to be called as the same species is the ability to breed among themselves and produce an offspring similar to them.

Biogeography enables to study the distribution as well as the reason for distribution of the organisms on different parts of the earth. There are three main fields of biogeography. They are:  1) historical, 2) ecological, and 3) conservation.

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some paleoanthropologists claim that neandertals were inefficient hunters. identify the evidence that refutes this hypothesis.

Answers

Both Neandertals and modern Homo sapiens exhibit the same frequency of food stress, as indicated by bone growth. Stable isotope analysis indicates that Neandertals consumed meat at about the same level as contemporary carnivores.

What are the characteristic features of homo sapiens ?

The humans or homo sapiens climbed trees and walked on the ground and the flexibility help to get around in a large habitats and cooperate with changing environment.

These human show Bipedalism Standing Up and Walking, Immaturity and its Consequences, dexterity, language and person hood.

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which organs and accessory structures are considered part of the upper gi tract? check all that apply.

Answers

Answer:

A. pharynx

B. duodenum

C. esophagus

D. stomach

Explanation:

DNA technology is used to find cures for genetic diseases such as Huntington's disease. Which of
these best explains the use of DNA technology in curing genetic diseases with gene therapy?

a. uses medicines to alter the genetic makeup of faulty genes

b. removes the faulty gene and replaces it with a working gene

C. causes mutation in faulty genes by exposing them to high-cnergy radiation

d. removes the faulty gene from the body without replacing it with another gene

Answers

Option B: removes the faulty gene and replaces it with a working gene,  best explains the use of DNA technology in curing genetic diseases with gene therapy

Gene therapy is a medical strategy that addresses the underlying genetic issue in order to treat or prevent disease. Instead of utilizing drugs or surgery, gene therapy procedures allow doctors to treat a problem by changing a person's genetic composition.

The first gene therapy technique, also known as gene transfer or gene addition, was created to:

Add a new gene to cells to aid in the treatment of a disease.Introduce a healthy copy of the gene to replace the disease-causing altered copy.

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What type of cells are the pollen and ovules of the pea plant flower?

Answers

The pollen and ovules of the pea plant flower are haploid cells.

Pollen and ovules are both forms of gametophytes found in the pea plant flower. Pollen grains are haploid cells that are formed by male reproductive organs containing sperm cells. They are discharged into the air and then travel to the reproductive organs of the female. Ovules are haploid cells generated by the female reproductive organ and containing egg cells. When pollen grains come into contact with ovules, they can combine to produce a diploid cell that will eventually develop into a seed. Pollen and ovules carry distinct genetic material that is used to make the seed. This genetic material is a blend of both the male and female parent's genetic material, allowing for genetic variety.

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Q 2. In fruit flie, red eye (A) are dominant to black eye (a) and long wing are dominant to hort wing. Aume that a cro wa made between fruit flie of genotype AAbb (red-eyed with hort wing) and thoe of genotype aaBB (black eye with long wing). Give the Punnett quare for the expected F2 progeny (offpring) type

Answers

Red eyes are more prevalent than green eyes in fruit flies. AaBb x aabb would be the offspring of a cross between such a short-winged, green-eyed fly as well as a long-winged, red-eyed fly.

The parents are homogeneous for these recessive features because red eyes are dominant over green eyes and large wings were dominant over small wings. A short-winged, green-eyed parent's genotype is aabb, and a long-winged, red-eyed parent's genotype is AaBb.

Red-eyed and green-eyed offspring are produced in a ratio of 1:1, as are offspring with long and short wings. One dominant and one recessive offspring result from a cross involving heterozygous dominant & homozygous recessive genes. This indicates that the parent fly's large wings and red eyes are heterozygous for the color of the eye.

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Explain how genetic information, along with an undertanding of the proce of decent with modification, enable cientit to recontruct phylogenie that extend hundred of million of year back in time

Answers

Genetic information, along with an understanding of the process of descent with modification, enable scientists to reconstruct phylogenies that extend hundreds of millions of years back in time. Phylogeny is the study of evolutionary relationships between species, and understanding these relationships is essential for understanding the history of life on Earth.

Comparative genetics is the primary tool used to reconstruct phylogenies. In this technique, scientists compare the genetic sequences of different organisms to determine how closely related they are. By looking at the similarities and differences in the genetic sequences of different species, scientists can trace the evolutionary relationships between them. For example, the genetic sequences of humans and chimpanzees are very similar, indicating that humans and chimpanzees share a common ancestor.

Scientists can also use the fossil record to reconstruct phylogenies. Fossils provide direct evidence of the evolutionary history of species, as they are the preserved remains of the organisms that lived in the past. By examining the fossil record, scientists can determine how long ago two species diverged from a common ancestor.

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how does air pollution increases green house effect.explain?​

Answers

Answer: la pollution de l’air augmente l’effet de serre en augmentant les concentrations de gaz à effet de serre (CO2, CH4, N2O et HFCs) et en produisant des substances qui contribuent à l’accumulation de ces gaz.

Explanation:

The repeating unit of a skeletal muscle fiber is the _____.
A) sarcolemma
B) myofibril
C) sarcoplasmic reticulum
D) sarcomere
E) myofilament

Answers

option b

The repeating unit of a skeletal muscle fiber is the myofibril.

colorless structure behind the iris, sharpens the focus of light rays onto retina. is the meaning of ___

Answers

Answer: Lens

Explanation:

Behind the iris, the lens is made up of transparent proteins called crystallin and supported by ciliary muscles. It bends the light rays passing through it, to fall on retina where receptor cells sense.

loosely aggregated dna bound to proteins in a eukaryotic cell is called (what structure)? when the cell divides, this condenses into (what structure)?

Answers

loosely aggregated dna bound to proteins in a eukaryotic cell is called as chromatin. when the cell divides, this condenses into chromosomes.

Special proteins (histones) in the nucleus bundle the DNA double helix into a structure known as chromatin. To create the chromosome, the chromatin goes through further condensation. Because of this, chromosomes are the higher order of DNA organization while chromatin is of a lower order. The number of chromosomal pairs in an organism is used to measure its genetic makeup. Humans contain 23 pairs of chromosomes, for instance. The majority of live cells include a compact structure of nucleic acids and proteins called a nucleus that houses genes, which convey genetic information.

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The carbon contained in peat down to 1 meter is equivalent to how many years of fossil-fuel burning at the current rate of emissions?.

Answers

By burning fossil fuels, 3.3 billion tonnes of this enormous amount are kept in the atmosphere. Burning fossil fuels results in an annual release of 5.5 billion tons of carbon. 3.3 billion tons of this enormous amount are retained in the atmosphere.

What are fossil fuels?

Decomposing plants and animals make up fossil fuels. The crust of the Earth contains these fuels, which can be burned to produce energy. One example of a fossil fuel is coal, which also includes natural gas and oil.

Plankton and plant matter are converted into fossil fuels after spending millions of years underground. Plankton decays into natural gas and oil, whereas plants turn into coal. Humans currently use coal mining, offshore oil and gas drilling, and other methods to extract these resources.

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a deficiency or impaired endogenous synthesis of tyrosine will most likely lead to low plasma levels of these hormones except:

Answers

A deficiency or impaired endogenous synthesis of tyrosine will most likely lead to low plasma levels of these hormones except Melatonin.

Tyrosine is a non-essential amino acid produced by the body from phenylalanine. It is necessary for the manufacture of several important brain chemicals known as neurotransmitters, such as epinephrine, norepinephrine, and dopamine.

Melatonin is a naturally occurring substance discovered in plants and animals. It is best known in animals as a hormone secreted by the pineal gland in the brain at night, and it has long been linked to the regulation of the sleep-wake cycle. Melatonin is a hormone produced by your brain in reaction to darkness. It aids in the timing of your circadian rhythms (24-hour internal clock) as well as your sleep. Light exposure at night can inhibit melatonin production. Melatonin stimulation causes tyrosine phosphorylation of a protein with a high molecular weight.

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HELP ASAP PLS
In 1839 a scientist named Theodor Schwan proposed a theory that later became known as the cell theory. The theory stated the following.

1.All living things are made up of cells.
2.The cell is the most basic unit of life.

The theory at the time did not include where cells came from. In 1859, Louis Pasteur conducted an experiment that showed that living cells must come from other living cells. This idea was added to the cell theory. The other two points of the theory were not discarded, so the theory was modified. Why was the older cell theory modified and not discarded?

A.
Scientific theories cannot be discarded after a certain period of time has passed.
B.
The first two ideas of the theory cannot be changed since they are scientific laws.
C.
The first two ideas of the cell theory were still supported by evidence.
D.
Scientific theories require the use of some older scientific knowledge in order to be valid.

Answers

C. The first two ideas of the cell theory were still supported by evidence.

The cell theory was modified, rather than discarded, because the first two points of the theory were still supported by evidence. Even though Louis Pasteur's experiment showed that living cells must come from other living cells, the idea that all living things are made up of cells and that the cell is the most basic unit of life was still considered valid and supported by scientific evidence.

Therefore, the cell theory was modified to include Pasteur's discovery, rather than being discarded and replaced with a completely new theory. This is common in science, as theories are often modified and updated as new evidence and discoveries are made, rather than being discarded and replaced entirely.

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Most sympathetic effector junctions release norepinephrine but a significant number release acetylcholine instead. Which of these is an example of an organ of the cholinergic type?

A) the heart
B) a blood vessel in the skin
C) a sweat gland
D) the liver
E) the salivary glands

Answers

(C) a sweat gland

SWEAT GLAND

A sweat gland is present on the skin in the form of small tubules.Also known as sudoriferous or sudoriparous glands.It is an exocrine gland.

WHAT IS CHOLINERGIC?

It is the term used for acetylcholine.Acetylcholine is the neurotransmitter, secreted by pre and post ganglions neurons.There are two kinds of cholinergic receptors:

1. Nicotinic cholinergic receptors: both nicotine and acetylcholine can attach to these receptors.

2. Muscarinic cholinergic receptors:  both muscarinic and acetylcholine can attach to these receptors.

Hence, these receptors increase the signal transduction rate hence, the secretion of sweat is controlled.

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Which term best describes a specially developed characteristic that enables an organism to live in a specific environment?

Answers

Adaptation is a specially developed characteristic that enables an organism to live in a specific environment.

What is adaptation?

"Adaptation is the feature of an organism's behaviour or physical makeup that enhances the organism's capacity for survival in its environment."

Living things adjust to their environment to survive. This is so that they can live, thanks to unique characteristics. These unique characteristics have evolved as a result of gene mutation during evolution. These mutations aid in reproduction and survival and are passed down from generation to generation.

For living things to survive, adaptation is crucial. Animals that can't shift with their surroundings pass away. Genetic alterations have led to these adaptations. The altered genes are passed on to the next generation of animals by the survivors.

Examples:

Succulent plants, which store water in their short, thick stems and leaves, have evolved to thrive in this environment are the adaptation of the plants to survive in hot and dessert areas.The streamlined bodies of aquatic fish and mammals, the light bones of flying birds and mammals, the long dagger-like canine teeth of carnivores, and the long necks of giraffes for feeding in the tops of trees.

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in general, sympathetic innervation of visceral organs via the lumbar and sacral splanchnic nerves inhibits the activity of these organs. this is logical because

Answers

The body is prepared to go into a resting state by sympathetic input.

Along with its opposite, the parasympathetic nervous system, the sympathetic nervous system is a component of the autonomic nervous system.

The origin of the sympathetic nervous system is found within the thoracic and lumbar regions of the spinal cord also known as the thoracolumbar division (T1 to L2,3).

The sympathetic nervous system is crucial for maintaining body balance while at rest and for triggering the "fight-or-flight" response in dangerous situations. To enable a sufficient reaction to a threat or trauma, the sympathetic system activates a number of intricate pathways.

Faster breathing, elevated heart rate and blood pressure, dilated pupils, diversion of blood flow to vital organs (such as the brain and muscles), and increased sweating are a few of these physical impacts.

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respiration involves the breakdown of sugar. this process results in the production of energy for the cell. assess the model to determine what gas must be present in order for cells to produce the most energy.

Answers

The gas that must be present in order for cells to produce the most energy is oxygen.

what is respiration?

Respiration can be best explained as a metabolic process that occur in  living cells of an organism that gives energy (in the form of ATP) by taking in oxygen and releasing  carbon dioxide from the oxidation of complex organic substances.

what is sugar?

sugar can be referred as a caloric, sweet-tasting compounds which  is sucrose, a disaccharide, which compressed of two sugars (glucose and fructose) bound together.

what is oxygen?

Oxygen is simply  a colourless, odourless, tasteless gas essential to living organisms.

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what term is used to describe image noise caused by an insufficient number of x-ray photons interacting with a digital image receptor?

Answers

Quantum mottle term is used to describe image noise caused by an insufficient number of x-ray photons interacting with a digital image receptor.

A sort of radiographic noise known as quantum mottle is inversely proportional to the number of x-ray photons that leave the patient and create the radiographic image. Images will appear gritty or sandlike if there are fewer photons that reach the image receptor, causing an unfavorable fluctuation in picture densities.Due to a mistake in the predetermined exposure settings, quantum mottle noise is caused by an ineffective number of photons reaching the imaging plate (mAs and kVp). This may result in a grainy image, which can be easily fixed by modifying the mAs or kVp, depending on which is more appropriate for the clinical situation.

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you sample a population of crabs and find that 40% are homozygous dominant, 50% are heterozygous, and 10% are homozygous recessive. what is the frequency of p in this population?

Answers

By Hardy- Weinberg equilibrium the frequency of p is 0.4.

The Hardy-Weinberg equilibrium is a principle stating that the genetic variation in a population will remain constant from one generation to the next in the absence of disturbing factors.

The Hardy-Weinberg Equilibrium is an important fundamental principal of population genetics, which states that genotype frequencies in a population remain constant between generations in the absence of disturbance by outside factors.

For populations in the Hardy-Weinberg equilibrium, the equation connects allele frequencies to genotype frequencies. This equation allows us to compare a population's genetic structure in reality over time to the expected genetic structure if the population were in Hardy-Weinberg equilibrium.

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Which of the following statements are true about asexual reproduction :
a) There is no involvement of gametes.
b) One living organism divides and produces two identical species.
c) Budding, fission, spore formation are some examples for asexual reproduction.
A) a and b are true
B) b and c are true
C) a and c are true
D) a,b and c are true​

Answers

Answer:

A and B are true

Explanation:

Asexual Reproduction

What is a capsid made of?
a) protein
b) glucose
c) peptidoglycan
d) adenosine triphosphate

Answers

Explanation:

Subunits of protein called capsomers

The answer is a. Capsids are made of protein.

2. explain the role the environment plays in two of the options listed on the reproductive technology options. how would this affect what parents hoped they could achieve by altering genes?

Answers

Examples of ART include invitro fertilization (IVF), gamete intrafallopian transfer (GIFT), pronuclear fallopian tube transfer (PROST), fallopian tube embryo transfer (TET), and fertilized egg intrafallopian transfer (ZIFT).

Assisted reproductive technology (ART) is used to treat infertility. This includes fertility treatments that treat both eggs and sperm. It works by removing the egg from the ovary. The egg is then mixed with sperm to create an embryo. By this definition, ART includes all fertility treatments involving either oocytes or embryos. Generally, ART procedures involve surgically removing an egg from a woman's ovary, combining the egg with sperm in a laboratory, and either returning it to the woman's body or donating it to another woman. Unlike animal species that mostly rely on se-xual reproduction, some plants reproduce se-xually and others asexu-ally. Sexual reproduction in plants is usually dependent on pollinators, whereas ase-xual reproduction is independent of these pathogens.

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Construct an explanation for how the compositions and structures of these carbon-based molecules are related to the way they interact with your bloodstream

Answers

The polarity-based collision with aqueous blood causes glucose, which is primarily composed of hydrogen and oxygen as well as carbon, to dissolve in the blood.

What is glucose?

Glucose is defined as a straightforward sugar having the chemical formula C6H12O6. The most prevalent monosaccharide, a type of carbohydrate, is glucose. The bloodstream carries glucose to the cells.

Lipids are mostly composed of carbon and hydrogen, which prevents the same attraction from occurring and renders them intractable. It can be packaged and transparent with lipoproteins thanks to its simplified architecture.

Thus, the polarity-based collision with aqueous blood causes glucose, which is primarily composed of hydrogen and oxygen as well as carbon, to dissolve in the blood.

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FILL IN THE BLANK. macromolecules, the molecules of life, include all of the following except __________.

Answers

Answer:

trace elements

Explanation:

Macromolecules, the molecules of life, include all of the following except trace elements.

suppose that the plasma membrane of a neuron has more k leak channels than na leak channels. what effect would this have on the resting membrane potential?

Answers

The resting plasma membrane would become more potential inside-positive as more Na+ ions leak into the cell and fewer K+ ions leak out, resulting in a net increase in the Na+ ion concentration in the cell.

A difference in voltage across the plasma membrane is produced by the selectivity of Na+ and K+ channels in the presence of concentration gradients. This voltage difference is essential for a number of biological processes, such as nerve concentration , muscle cell contraction, hormone secretion, and the regulation of osmotic concentration . The action potential's repolarization phase would be most impacted by blocking the sodium inactivation mechanism. The resting potential would remain unchanged. The action potential would merely have a longer duration than usual as the only effect.

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contains the pigment, or eye color, and has a "hole" in the center called the pupil

Answers

Contains the pigment, or eye color, and has a "hole" in the center called the pupil is called the iris.

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