Parallel and Perpendicular Lines

Slopes of parallel lines are...

• negative reciprocals.

• opposites.

• identical/same.

• always 7.

Slopes of perpendicular lines are...

• negative reciprocals.

• opposites.

• identical.

• always 7.

What slope is parallel to:

m = 4

• 4

• $-\frac{1}{4}$

• -4

• $\frac{1}{4}$

What slope is perpendicular to: 

 $m=\frac{5}{8}$  

•  $-\frac{5}{8}$  
  

•  $\frac{5}{8}$  

•  $-\frac{8}{5}$  

•  $\frac{8}{5}$  

What slope is perpendicular to:

m = 3

• -3

• $-\frac{1}{3}$

• 3

• $\frac{1}{3}$

 $y=\frac{5}{7}x-1$  
 $y=\frac{5}{7}x+30$  
These lines are...

• Parallel

• Perpendicular

• Neither

y = 6x + 2

y = -6x + 2

These lines are...

• Parallel

• Perpendicular

• Neither

 $y=-\frac{2}{3}x+2$ 
  $y=\frac{3}{2}x+9$  

These lines are...

• Parallel

• Perpendicular

• Neither

 $y=\frac{3}{2}x+2$  

 $y=\frac{2}{3}x+6$  

These lines are...

• Parallel

• Perpendicular

• Neither

A line is parallel to y = 2x - 7.

What is it's slope?

• -2

• 
  

  $\frac{1}{2}$

• $-\frac{1}{2}$

• 2