1) 2x + 5y = 17
6x - 5y = -9
2) 7x + 2y = 10
-7x + y = -16
3) 2x - 3y = 61
2x + y = -7
4) 8x + 11y = 20
5x - 11y = -59
5) y = 2x
y = x-1
6) (try dividing)
3x - 10y = -25
4x + 40y = 20
7) 2x + 4y = 8
5x + y = -7
8) 7x + 15y = 32
x - 3y = 20
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