2012-03-22 09:00:04

If 2x + y = 17, and x + 2y = 25, what does x + y equal?

The correct answer is 14

Explanation: Combine the two equations by adding them together:

2x + y = 17
+ x + 2y = 25
3x + 3x = 52

Now, factor out the common factor of 3: 3(x + y) = 3(14), meaning x + y = 14.