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Perpendicular Lines

Interactive practice questions

Select the single best definition that describes two perpendicular lines.

Two lines that intersect each other at an angle of 90°.


Two lines that have only one intersection.


Two lines whose product of gradients is equal to $1$1.


Two lines that have no intersections.

Less than a minute

If two lines are perpendicular, what is the product of their gradients?

Are the lines $y=x+2$y=x+2 and $y=x-2$y=x2 perpendicular?

Are the following lines perpendicular:

$L_1$L1: $y=7x-5$y=7x5

$L_2$L2: $y=-7x+6$y=7x+6

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