Question

What is the solution to this system of equations?

x − 2y = 15
2x + 4y = -18

Answer 1

y=-6 ; x=3

Explanation:

x − 2y = 15

2x + 4y = -18

x − 2y = 15

+2y . +2y

x=2y+15

2(2y+15) + 4y = -18

4y+30+4y=-18

8y+30=-18

-30 . -30

8y=-48

y=-6

x=2(-6)+15

x=-12+15

x=3