3x + y = 7; 2x - y = 7

To solve this system of equations, you can use the method of elimination.

First, multiply the second equation by -1 to eliminate y:

-1(2x - y) = -1(7) -2x + y = -7

Now, add the first equation and the modified second equation:

3x + y + (-2x + y) = 7 + (-7) x = 0

Substitute the value of x into one of the original equations (let's use the first equation):

3(0) + y = 7 y = 7

Therefore, the solution to the system of equations is x = 0 and y = 7.