# Practice GMAT Problem Solving Question

Return to the list of practice GMAT problem solving questions.

2x + 3y = 16 and y = -6x; -x=?

Correct Answer:

**E**- Start by combining the two equations. Since the second equation is already solved for y, plug it into the first equation to yield:

2x + 3y = 16

Since y = -6x

2x+3(-6x)=16 - Simplify like terms:

2x+3(-6x)=16

2x+(-18x)=16

-16x=16. - Divide by -16 to yield x=-1. Be careful though: the question asks for the value of -x, not x.
- Since x=-1, -x=1. So the correct answer is E.

Return to the list of practice GMAT problem solving questions.