Any line which has a gradient which is not 2 will not be parallel to the line y = 2x + 1.
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x = negative 1 is a vertical straight line parallel to the y axis at x = -1 ; its slope is infinite
-2x=2y+5 +2x -2y -2y=2x+5 /-2 y=-1/1+2.5
They are parallel lines
y-2x=3 -y -y -2x=3-y -3 -3 -2x-3=-y /-1 /-1 2x+3=y y=2x and y=2x+3 have the same slope of 2, so they are parallel. Hope this helps! ;D