Question

3x - y = 7

6x - y = 10

When solving this system of equations by elimination, which could be the resulting equation when a variable has been eliminated?
A) 9x - 2y = 17
B) -3y = 24
C) -3x = -3
D) 9x = 17
Elim

Answer 1

C) -3x=-3

Explanation:

When you subtract the 3x-y=7 from 6x-y=10, you will receive the following equation:

3x-6x-y-(-y)=7-10

-3x-y+y=-3

-3x=-3

As we can see, this equation matches the one in option C, meaning that it's our answer!