Mathematics High School

10. What is the value of x in the solution to the system of equations?
x – 2y = 7
3x + 2y = 21
+/-

Answers

Answer 1

Solve for x in first equation:

x-2y=7

Add “2y” to both sides

x=2y+7

Put this in to second equation:

3(2y+7)+2y=21

Solve for y:

Distribute the 3 into the ()

6y+21+2y=21

Combine the like y terms

8y+21=21

Subtract 21 from both sides

8y=0

Divide by 8 on both sides

y=0

Put this into the first solved equation:

x=2(0)+7

Solve for x:

Multiple 2(0)

x=0+7

Add 0 and 7

x=7

So the value of x is positive 7.

Related Questions

At the beginning of a laboratory experiment, the temperature of a substance is -12.6 °C. During the experiment, the temperature of the substance decreases 7.5 °C. What is the final temperature of the substance?
!!!!SHOW YOUR WORK!!!!

Answers

Answer

20.1°C

Step-by-step explanation:

-12.6 °C - 7.5 °C =-20.1°C

Answer:

the initial temperature= -12.6⁰c

change in temperature= 7.5⁰c

the final velocity = x

-12.6-7.5=x

-20.1=x

so therefore the final temperature is -20.1

sports drinks- $1.75
pizza- $2.25

Answers

Answer:

7 drinks

Step-by-step explanation:

7x1.75=12.25

4 x 2.25= 9

added - 21.25

log b x= y
Which variable can be negative???

Answers

Answer:

last one

Step-by-step explanation:

Write an equation of the line that passes through (-2, 3) and is parallel to the line y= 2x-4​

Answers

Answer:

A hi esta la solucion

Step-by-step explanation:

Answer:

y=2x+7

Step-by-step explanation:

Since the answer HAS to be parallel to the line y=2x-4, that means the only number that should change is the y-intercept (the last number in the equation.) y-intercept is the x-value when y=0, which basically means, if you put the line onto a graph, look for the point when the line passes through the y-axis, then look at how far up or down that point is (x-value). That will be your answer. Since the line passes through the y-axis at x=7, the answer is y=2x+7! Sorry if this is too confusing, I'm not good at teaching XD

4. The graph of a linear function is shown. Which best
describes the slope of the line?
A. Zero Slope
B. Undefined Slope
C. Negative Slope
D. Positive Slope

Answers

Negative slope So c


Find the solution of this system of equations:
X - 10y = -59
-4x + 10y = 86
0 (-9,5)
(5,9)
(5,-9)
(9,-5)

Answers

Answer:

y=-3.667

x=

Step-by-step explanation:

-4(10y-59)+10y=86

30y+196=86

30y=-110

y=-3.667

find the slope of the graph​

Answers

Answer:

It's undefined. x=4

Step-by-step explanation:

It’s undefined a undefined slope is a line that goes straight up and down

idk what i'm doing :(

Answers

Here is an equation for those numbers you can write this multiple ways but this is the easier form

Help ME PLEASE !9 POINTS !!!

Answers

Answer:

5x7x6= 210

Step-by-step explanation:

Answer:

the area is 36

Step-by-step explanation:

use (a+b/2)h

or use google lol

(5+7/2)6 - numbers in formula

(12/2)6 - parentheses

(6)6 - parentheses

36 - multiply

hope that helped

please help me and can you explain thank you

Answers

Answer:

(4,2), there is already a 4 in x value

Step-by-step explanation:

Tell whether each function is linear or nonlinear. Use the drop-down menus to show your answer.

Answers

function a is non linear while function b is linear

explanation: for function a, y is increasing at a non linear rate (not consistent)

y+1/y-1 = 2y+3/2y+5 simplify​

Answers

Answer: y=0.6 I think (try checking with other answers first)

Hope this helps a little and good luck :)

Step-by-step explanation:

Can someone help me with this question

Answers

Answer:

Step-by-step explanation:

All real numbers

A store manager instructs some new trainees that a video game priced at $53 winds up
costing a customer $55.65 once the sales tax is included. What is the sales tax percentage?

Answers

Answer:

the answer is $57.67

Step-by-step explanation:

the way I found that solution $1.59 was 3% which winds up being 6% of the normal cost of the game which will be $57.77

Will mark brainliest for whoever answers

Answers

Answer:

No

Step-by-step explanation:

You have to do it.

Solve: 1,243 = 12
Show the remainder as a fraction.

Answers

If you meant 1243/12 then the answer is 103 and 7/1243

WILL GIVE BRAINLIEST PLEASE HELP URGENT
Harris graphs the system of equations to determine its solution.

5x−y=55x+y=15

What is the correct solution?

Enter your answer by filling in the boxes. (__,__)

Answers

(1/2, -25/2). because 60x=30 , x=1/2,5x1-2-y=15, y=-25/2.

The intersection point of a system of equation is the solution of the system.

The solution to the system of equations is (2,5)

The equations are given as:

[tex]\mathbf{5x - y = 5}[/tex]

[tex]\mathbf{5x + y = 15}[/tex]

See attachment for the graphs of [tex]\mathbf{5x - y = 5}[/tex] and [tex]\mathbf{5x + y = 15}[/tex]

From the graph, the point of intersection is (2,5).

Hence, the solution to the system of equations is (2,5)

Read more about system of equations at:

https://brainly.com/question/12895249

My mom likes to support my efforts on the cycling team, so she is always there to watch me race. At the last race, she became so excited that she promised to buy me 4 cupcakes for every three laps I completed. I completed a whole race, a whopping 24 laps! How many cupcakes did my mom buy me? Just write a number for an answer.

Answers

Answer:

I think that the answer is 32 cupcakes. I am sorry if this is wrong, but go subscribe to me at SSSniperwolf and LittleLia.

Step-by-step explanation:

Like 32-34 I think.
..

Frenando finished 6/8 of his homework greta finished 6/8 of her homework find a fraction that represent the amount of work that greta finished in a different form but equal to 6/8

Answers

Answer:

3/4

Step-by-step explanation:

you can write it in a different form by simplifying. 6/2 = 3. 8/2 = 4 so the answer is 3/4



The tables show four relationships between x and y. In which table is there a NEGATIVE rate of change?
A)ᴛᴀʙʟᴇ ᴀ
B)ᴛᴀʙʟᴇ ʙ
C)ᴛᴀʙʟᴇ ᴄ
D) ᴛᴀʙʟᴇ ᴅ

ɪ'ᴍ sᴛᴜᴄᴋ ᴏɴ ᴛʜɪs ᴏɴᴇ ᴛᴏᴏ!
ᴀɴʏᴏɴᴇ ᴋɴᴏᴡ ᴛʜɪs ᴏɴᴇ?

Answers

Answer:

C

Step-by-step explanation:

Try using a scratch piece of paper to graph the points of each table to see which one would have a negative slope. Or use the formula y1-y2/x2-x1 to find the slope and see which one is negative.

3.
Solve using traditional division: 3,385 divided by 31.

Answers

Answer:

109.193548

Step-by-step explanation:

Answer:

109 r6

Step-by-step explanation:

what percent of 16 is 75? round to the nearest hundredth

Answers

Answer:

-21.3333333333%

negative twenty-two point three percent repeating

Need help !!!! thanks

Answers

Answer:

same side interior, and adjacent

Step-by-step explanation:

The equation 2x-7=5+x has exactly one solution. True or false

Answers

Answer:

True

Step-by-step explanation:

x=5+7=12

The only solution is x=12.

Write the sum as a product of two factors
27w+15

Answers

Answer:

I'm pretty sure it is 1.8.

Step-by-step explanation:

Which description of the vector shown is correct?
O The magnitude is 15, and the direction angle is
approximately 49º.
O The magnitude is 15, and the direction angle is
approximately 41°.
O The magnitude is 113, and the direction angle is
approximately 49°
O The magnitude is 113, and the direction angle is
approximately 41°

Answers

Answer:

D

Step-by-step explanation:

Edge 2020

Answer:

D

Step-by-step explanation:

Solve -2a - 5>3
Which graph shows the solutions?

Answers

-4>3

Step-by-step explanation:

Answer:

First line

Step-by-step explanation:

Isolating 2a is the first step, so adding 5 to each side. That leaves -2a > 8. Divide both sides by -2, and because it's a negative, you flip the sign. so you get a < -4

Need help on this thank you if you help

Answers

Answer:

a. 2/5

b. 1/2

c. 100/9

Step-by-step explanation:

a: Multiply bottom and top by 100 to keep values the same and make the fraction a whole fraction:

.12 × 100 = 12

.3 × 100 = 30

Simplify: 12/30 = 2/5

b: Multiply bottom and top by 1,000 to keep values the same and make the fraction a whole fraction:

.125 × 1,000 = 125

.25 × 1,000 = 250

Simplify: 125/250 = 1/2

c: Multiply bottom and top by 100 to keep values the same and make the fraction a whole fraction:

4 × 100 = 400

.36 × 100 = 36

Simplify: 400/36 = 100/9

PLEASE HELP ME

ILL GIVE YOU BRAINIEST

PLEASE ASAP

Answers

Answer:

b

Step-by-step explanation:

Write the ratio as a fraction in simplest form, with whole numbers in the numerator and denominator.
16 gal : 24 gal

Answers

2:3 . you divide the numbers by the greatest factor. which is 8. 24 divided by 8 is 3, 16 divided by 8 is 2. =2:3
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