These
x + y = 4
y = -x + 4
y - 4x = 8
y = 4x + 8
3x + y = 12
y = -3x + 12
x + y = 4
y = -x + 4
x + 4y = -31
y = -1/4x - 31/4
-2x + y = 1
y = 2x +1
x - 4y = 8
y = 1/4x +2
2x + y = 41
y = -2x +41
3x + 4y = 8
y = -3/4x + 2
x - 3y = 17
y = 1/3x - 17/3
4x - 2y = 12
y = 2x - 6
2x + y = -11
y = -2x - 11
3x - y = 16
y = 3x - 16
5x + 2y = 9
y = -5/2x + 9/2
8x - 3y = 17
y = 8/3x - 17/3
3y = 2x + 15
y = 2/3x + 5
2y = -x - 8
y = -1/2x - 4
-5x - y = 12
y = 5x - 12
-6x + 9y = 11
y = 2/3x + 11/9
-7x - 2y = 18
y = -7/2x - 9
1/4y = -5x
y = -20x
y - 4 = -3(x - 3)
y = -3x + 13
6x + 2y = 12
y = -3x + 6
3x - 5y = 12
y = -3/5x - 12/5
-5x - 9y = 23
y = -5/9x - 23/9