Question

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

Answer 1

x=-2

Explanation:

Answer 2

x = - 2

y = 7

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

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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