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*Note: first eliminate one of the variables and solve for the other.
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Multiply all terms of second equation by '4'
-12*x+4y=8
Add equations together
-12x + 4y = 8
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-11x = 11
x = -1
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solving for y
-3x + y = 2
-3*-1 + y = 2
3 + y = 2
y = -1