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15x - 5y = 30
2x - 5y = 17 _
13x = 13
x = 1
3x - y = 6
3 - y = 6
y = 3 - 6
y = -3
y - x = -3 - 1
= -4
2x - 5y = 17 (x3)
6x - 2y = 12
6x - 15y = 51 _
13y = -39
y = -3
3x - (-3) = 6
3x = 6 - 3
3x = 3
x = 1
y - x = (-3) - 1 = -4