Question

Solve this system of equations.

3x+4y=4
-x-3y=7

Answer 1

x=8 y=-5

Explanation:

3x+4y=4 3x+4y=4

3(-x-3y=7)= -3x-9y=21

-3x-9y=21 -5y=25

y=-5

3x+4(-5)=4

3x-20=4

3x=24

x=8

Answer 2

x = 8, y = -5

Explanation:

Multiplying the 2nd equation by 3, we get -3x-9y = 21. Then eliminating with the first equation we get -5y = 25. y = -5. Substituting this into the original equation, we get x = 8.