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-x + 2y = 1 > x =-2y +1
3(-2y + 1) +y = 4
-6y + 3 + y = 4
-5y = 4 -3
-5y = 1
y= 1/-5
x= 2(1/-5) +1
= 2/-5 + 1
= -3/-5
= 3/5