How do you solve the system of equations 7x - 9y = 29 and 7x + 2y = - 15?

1 Answer
Mar 17, 2017

x = -1
y= -4

(-1, -4)

Explanation:

7x - 9y = 29
7x + 2y = -15

Subtract the like terms and, since the 7x's cancel out,
you're left with

-11y = 44

Divide both sides by -11 to get:

y = -4

Plug this value into one of the equations to get x, like this:

7x + 2y = -15
7x + 2(-4) = -15
7x - 8 = -15 7x = -7#

x = -1