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eqn1 5x - y = -6
eqn2 -x + y = 2
rearrange eqn1 to isolate y
y = -1*(-6-5x)
y = 6+5x
substitute this into eqn2
-x + 6 + 5x = 2
4x + 6 = 2
4x = -4
x = -1
substituting this into eqn1
-5 -y = -6
y = 1
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