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3x-y=8
1.5x - 0.5y = 4 /*(-2)
3x - y = 8
-3x + y = -8
3x - y = 8
y = 3x - 8
y = 3x - 8
1) x = 2
y = - 2
2) x = 4
y = 4
3) x = 5
y = 7