Question

2x + y = 3

x - 2y = -1



If equation two is multiplied by -2 and then the equations are added, the result is _____.

5y = 5
3y = 5
-3y = 3

Answer 1

Hey there!

First, multiply the second equation by -2 as the problem states. When you multiply the second equation by -2, you get:

-2x+4y=2

Now, add this equation to the first equation in which you simply combine like terms:

2x+y=3

+

-2x+4y=2

=

5y= 5

In conclusion, the correct answer would be the first choice.

Answer 2

The first answer is right