Question

Solve by substitution;
-5x-7y=9
-2x+y=-23
please/thanks:)

Answer 1

In general, you want to solve for one variable in one equation, and then put the expression for that variable into the other equation.

Answer 2

You can do that, or you can solve it this way:

-5x-7y=9
-2x+y=-23

y = (9 + 5x)/-7
y = -23 + 2x

y = y

-7(-23 + 2x) = 9 + 5x

161 - 14x = 9 + 5x
161 - 9 = 14x + 5x
152 = 19x
152/19 = x
8 = x
-7 = y

Answer 3

Okay, I'm about to go grocery shopping now. Catch you later.

Answer 4

THANK YOU!