Question

10x + 4y = 20
13x - 4y = -66
If x = -2, what is the value of y?

Answer 1

y = 10

Explanation:

If x = -2

10x + 4y = 20

10(-2) + 4y=20

-20+4y=20

4y= 20+20

4y=40

y=10

If x=2 and y=10

13x - 4y = -66

13(-2) - 4(10) =-66

-26 -(-40) = 66 so it all checks out!!