Intro to Parallel & Perpendicular Lines

Slopes of parallel lines are...

• opposite reciprocals

• opposites

• identical

• reciprocals

Slopes of perpendicular lines are...

• opposite reciprocals

• opposites

• identical

• reciprocals

What slope is perpendicular to:  
m = 5/8

• -5/8

• 5/8

• -8/5

• 8/5

What slope is perpendicular to:

m = -3

• -3

• -1/3

• 1/3

• 3

Choose ALL the lines PARALLEL to the following line: y = 2/9x - 7

• y = 2/9x + 8

• y = 9/2x -12

• -2y = 9x + 8

• 9y = 2x -18

Select ALL of the lines that are PERPENDICULAR to y = 3/4x + 9

• y = 3/4x - 3

• y = -3/4x + 9

• y = -4/3x + 8

• 3y = -4x + 5

• 4y = -3x + 7

Are the two linear equations parallel, perpendicular, or neither?

• Parallel

• Perpendicular

• Neither

y = 5/7x +2

y = 5/7x - 30

These lines are...

Parallel Lines: Same Slope

Perpendicular Lines: Negative Reciprocal Slopes (i.e. 2/3 and -3/2)

• Parallel

• Perpendicular

• Neither

y = 6x + 2

y = -6x + 2

These lines are...

Parallel Lines: Same Slope

Perpendicular Lines: Negative Reciprocal Slopes (i.e. 2/3 and -3/2)

• Parallel

• Perpendicular

• Neither

y = -2/3x + 2

y = 3/2x + 9

These lines are...

Parallel Lines: Same Slope

Perpendicular Lines: Negative Reciprocal Slopes (i.e. 2/3 and -3/2)

• Parallel

• Perpendicular

• Neither