Linear Equations II

Hong Kong

Stage 1 - Stage 3

Select the single best definition that describes two perpendicular lines.

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

A

Two lines that have only one intersection.

B

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

C

Two lines that have no intersections.

D

Easy

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`=`x`−2 perpendicular?

Are the following lines perpendicular:

$L_1$`L`1: $y=7x-5$`y`=7`x`−5

$L_2$`L`2: $y=-7x+6$`y`=−7`x`+6

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