4.3 Parallel and Perpendicular

Slopes of perpendicular lines are...

• negative reciprocals. (flip and switch)

• opposites.

• the same

• always 0

Find the slope given the points of a line:

(4,7) and (6,-3)

• -5

• 4/10

• -2

• 6

• -10

Write an equation of a line parallel to

y = x + 3 and that goes through (5, 3)

• y = x + 2

• y = - x + 1

• y = 2x + 1

• y = x - 2

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

A. y = 2x + 9

B: y = 2x − 5

C: y = -3x + 7

Which lines are parallel? Explain.

• A and B

• B and C

• A and C

• All three!

Tags

CCSS.HSG.CO.A.1

Are the lines parallel, perpendicular, or neither?

• Parallel
• Perpendicular
• Neither

Tags

CCSS.HSG.CO.A.1

CCSS.HSG.GPE.B.5

Slopes of parallel lines are ...

• the same

• opposites

• negative reciprecal

• always 0

Tags

CCSS.HSG.CO.C.11

Which figure shows a set of perpendicular lines?

• Figure 1
• Figure 2
• Figure 3
• Figure 4

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Write equation of the line that goes through the points

(6,3) and (4,1)

• y = -2x + 5

• y = x - 3

• y = -x + 5

• y = -1x + 6

Write the equation of the line that passes through the points:

(3, 4) and (0, -5)

• y = -3x + 5

• y = -5x - 5

• y = -3x + 4

• y = 3x - 5