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-x + 2y = -1 |×5| -5x+10y = -5
--------------------------------(+)
x = -3
3x - 5y = 1
3.(-3) - 5y = 1
-6 - 5y = 1
-5y = 6 + 1
y = -7/5
nilai x.y = (-3)(-7/5)
= 21/5
= 4 1/5