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Mars2501 [29]
3 years ago
6

If y=-3x, find x's and y's value in 4x-2y=-20

Mathematics
2 answers:
Harman [31]3 years ago
6 0

Answer:

x=-2

Step-by-step explanation:

Ierofanga [76]3 years ago
3 0

Answer:

x = - 2

y = 7

Step-by-step explanation:

4x - 2y = - 20

Now substitute - 3x for y.

4x - 2(-3x) = -20           combine the xs in the brackets

4x + 6x = - 20               Make the addition      

10x = - 20                      Divide by 10

x = - 20/10                     Do the division

x = - 2                            

===============

3x - 2y = - 20                 Put - 2 in for x  

3(-2) - 2y = - 20              remove the brackets              

- 6 - 2y = - 20                 Add 6 to both sides

-2y = - 20 + 6                 Combine

-2y = - 14                         Divide by - 2

y = - 14/-2                        

y = 7

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Answer:

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Step-by-step explanation:

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4 0
3 years ago
A construction company is building the house shown below. They need to use a scale
Svetllana [295]

The height of the building is calculated by representing 1 inch as 8 feet. The final building has a height of 20 feet.

<h3>What is scaling?</h3>

Scaling is the increase or decrease in the height of an object by a scale factor k.

Given that the scale used is:

1 inch = 8 feet. Hence:

Since the height of the building is 2.5 in, hence:

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7 0
1 year ago
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5 0
3 years ago
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Lesechka [4]
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The circumference of the earth is 2.4x109 miles. if you traveled at an average of 8.5x10 miles per hour, how long would it take
pshichka [43]

Answer:

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Step-by-step explanation:

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2.4 x 10^9 mi / 85 m/hr   = 28235294 hr

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8 0
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