The Student Room Group
Parallel = same gradient (i.e. y=2x+2 is parallel to y=2x)
Perpendicular = gradients of the 2 lines multiply to give -1
Reply 2
How do i draw this on a graph?



Red \Longrightarrow y=x y = -x
Green \Longrightarrow y=x y = x

Which are perpendicular.

Green \Longrightarrow y=x y = x
Blue \Longrightarrow y=x+2 y = x + 2

Which are both parallel.

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