3x-y=3 and x-y=4 solve the equation
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by eliminating y we get,
3x-x=3-4
2x=-1
x=-1/2
hence by substituting x then
-3/2-y=3
-3-2y=6
y=-9/2
3x-x=3-4
2x=-1
x=-1/2
hence by substituting x then
-3/2-y=3
-3-2y=6
y=-9/2
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