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.
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=x−2 perpendicular?
Are the following lines perpendicular:
Apply co-ordinate geometry techniques to points and lines
Apply co-ordinate geometry methods in solving problems