Question

Solve the system using elimination.
2x+6y=-12
5x-5y=10

A.(2, 1)
B.(0, –2)
C.(–2, 0)
D.(1, 2)

Answer 1

You need to add the equations together to eliminate one variable. You may need to first multiply one or both equations by factors to eliminate a variable. Look at both equations, if you add them, you'll get 7x + y = -2. No variable was eliminated. That means you need to multiply. Let's eliminate the x variable.
1. Multiply the first equation by -5 and the second equation by 2:
-5(2x + 6y) = -5(-12)
2(5x - 5y) = 2(10)

-10x - 30y = 60
10x - 10y = 20

Now add them:
-40y = 80
Solve:
y = -2

You can now plug in y = -2 into one of the original equations to get x.

Answer 2

x=0 so b is answer

Answer 3

Correct