how do i know if the lines are parallel perpendicular or neither?
If the equations have the same gradient, then it is parallel.
the + or - just tells you how far up/down the y axis it is
if, on the other hand, they are the same but the negative equivalent, then they are parallel
again, the + or - number doesnt matter; for example, & , & , and & are all perpendicular to each other
does this make sense?