You can watch this video for a refresher on how to solve a system of equations by equal values method.
y = 2x + 11
y = -3x + 1
y = 5x -2
x + y = 4
x = 3y - 10
-2x + 4y = -4
x + y = 17
x - y = -7
-5x + 9y = -12
3x + 2y = 22
10x + 7y = 1
-5x - 7y = 24
4x + 3y = 3
-6x + 8y = 58
5x + 4y = -14
3x + 6y = 6
2x + 8y = 6
-5x - 20y = -15
4x - 3y = 7
-8x + 6y = 4