Parallel and Perpendicular Sum

Slopes of parallel lines are...

• opposite reciprocals.
• opposites.
• the same.
• always 7.

Slopes of perpendicular lines are...

• opposite reciprocals.
• opposites.
• identical.
• always 7.

What is the slope of a line perpendicular to 5?

• 5

• 1/5

• -1/5

• -5

Are these lines parallel?

y = (-1/2)x + 1

y = (1/2)x - 5

• YES

• NO

Write an equation for a line perpendicular to
y = -5x + 3 through (-5, -4)

• y = -3x + 1/5
• y = -3x - 1/5
• y = 1/5x - 3
• y = -1/5x - 3

 $-6x+y=2$  and  $6x+y=2$  

• Parallel

• Perpendicular

• Neither

What is the slope of a line parallel to the line  $-2x+y=-7$  

• -2

• -1/2

• 1/2

• 2

Which equation best represents the line on the graph?

• y= 1/2x
• y= -1/2x
• y = 2x
• y = -2x

Give the equation for the graph

• y = 5x - 3
• y = 4x + 2
• y =-2x + 5
• y = - 2x + 4

What is the equation of this line?

• 0
• undefined 
• y = -2
• x = -2