Question

What is the solution to this system of equations?

x − 2y = 15
2x + 4y = -18


A.x = 1, y = -6



B.x = 1, y = -7



C.x = 3, y = -6



D.x = 3, y = -7

Answer 1

A) x − 2y = 15
B) 2x + 4y = -18
Multiplying A) by 2
A) 2x -4y = 30
B) 2x + 4y = -18

4x = 12
x = 3
Inputting into equation A)
A) 6 -4y = 30
-4y = 24
y = -6
answer is "C"