What is the y coordinate of the solution of the system?

Question

What is the y coordinate of the solution of the system?

x+5y=7

3x- 4y=40

What is the value of x ?

Answer 1

x+5y=7, x = 7 - 5y

3x- 4y=40

Substitute:

3(7 - 5y) - 4y = 40

21 - 15y - 4y = 40

-19y = 19

y = -1

x = 12