Question #N1008
If $x + 2y = 7$ and $x - 2y = 1$, what is the value of $x$?
A. 2
B. 3
C. 4
D. 5
Correct Answer is: C
We can solve this system of equations by adding the two equations together. Notice that the $y$ terms cancel out. We get $(x + 2y) + (x - 2y) = 7 + 1$. Simplifying, we have $2x = 8$. Dividing both sides by 2 gives us $x = 4$.