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 parallel to:

m = 4

• 4

• -1/4

• -4

• 1/4

What slope is perpendicular to:

m = -3

• -3

• -1/3

• 1/3

• 3

Determine the equation of a line perpendicular to y=-3x-2 and going through the point (9, 2), in slope-intercept form.

• $y=\frac{1}{3}x-3$

• $y=-\frac{1}{3}x-9$

• $y=\frac{1}{3}x-1$

• $y=-3x-9$

The slopes of parallel lines are...

• the same

• opposite

• always different

What is the slope in the equation y=2x + 3?

• 2
• 3
• 5
• Cannot be Determined 

Are these two lines parallel, perpendicular or neither?
y = -1/3x - 5
y = 1/3x + 2

• Parallel
• Perpendicular
• Neither

Are these two lines parallel, perpendicular or neither?

y = -1/4 x - 5

y = 4x + 2

• Parallel

• Perpendicular

• Neither