Perpendicular Lines (Junior Cert Mathematics): Quizzes

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Perpendicular Lines
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At what angle do perpendicular lines meet?

9090 degrees

What do the slopes of perpendicular lines multiply to give?

−1-1

If a line has a slope of 22, what is the slope of a perpendicular line?

−12-\frac{1}{2}

If a line has a slope of −3-3, what is the slope of a perpendicular line?

13\frac{1}{3}

What shape do perpendicular lines form where they cross?

An 'LL' shape

If slopes mm and m′m' are perpendicular, which formula is correct?

m×m′=−1m \times m' = -1

Are lines with slopes 22 and −12-\frac{1}{2} perpendicular?

Yes

For y=2x+1y = 2x + 1, what is the slope of a perpendicular line?

−12-\frac{1}{2}

How can you visually spot perpendicular lines on a graph?

They meet at a right angle

What is the quick method to find a perpendicular slope?

Flip it and change the sign

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