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If you mean: 2x-y = 4 then y = 2x-4 which is a straight line equation that can be graphed on the Cartesian plane
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y=-10x-4
y=2x-4 y=2x-5 y=1 1=2x-4 -2x = -5 x=2/5 the solution is (x,y) = (2/5,1)
Any line which has a gradient which is not 2 will not be parallel to the line y = 2x + 1.