SOLUTION: Solve the system: {-x + y = 2 {2x + y = -1 Please and Thank you!

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Question 260278: Solve the system:
{-x + y = 2
{2x + y = -1
Please and Thank you!
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
There are many ways to solve these of course.
1)multiply the first by 2 and then add the equations will eliminate x
2)subtract either from the other as they are now will eliminate y
3)solve both for y and then set them equal