Practice GMAT Problem Solving Question

Return to the list of practice GMAT problem solving questions.

rss
2x + 3y = 16 and y = -6x; -x=?
Correct Answer: E
  1. 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
  2. Simplify like terms:
    2x+3(-6x)=16
    2x+(-18x)=16
    -16x=16.
  3. Divide by -16 to yield x=-1. Be careful though: the question asks for the value of -x, not x.
  4. Since x=-1, -x=1. So the correct answer is E.

Return to the list of practice GMAT problem solving questions.