3.3 Parallel and Perpendicular Slopes

Compare

100

Are these slopes Parallel, Perpendicular, or Neither: 

m = 5/1

m = -2/3

What is Neither?

200

Are these Parallel, Perpendicular, or Neither: 

m = 5

m = 5

What is parallel?

300

Are these Parallel, Perpendicular, or Neither: 

m = 5

m = -1/5

What is perpendicular?

400

Are these Parallel, Perpendicular, or Neither: 

m = 2/3

m = -2/3

What is Neither?

500

Are these Parallel, Perpendicular, or Neither: 

m = -15/3

m = 1/5

What is perpendicular?

What is the Slope?

100

Find the slope of the line given two points

(0,0) and (4,5)

m= 5/4

200

Find the slope of the line given two points

(2,5) and (1,6)

m= -1

300

Find the slope of the line given two points

(-6,10) and (3,-1)

m= -11/9

400

Find the slope of the line given two points

(8,-5) and (-5,-8)

m= 3/13

500

Find the slope of the line given two points

(-9,16) and (-11,16)

m = 0

Parallel, Perpendicular, or Neither?

100

Are the Slopes of Line AB and Line CD Parallel, Perpendicular, or Neither

A: (-3, 13) B: (4, -15)

C: (-2, 5) D: (1, -7)

Line AB: -4   Line CD: -4

Parallel

200

Are the Slopes of Line AB and Line CD Parallel, Perpendicular, or Neither

A: (-3, 8) B: (3, 2)

C: (7, 1) D: (5, -1)

Line AB: -1   Line CD: 1

Perpendicular

300

Are the Slopes of Line AB and Line CD Parallel, Perpendicular, or Neither

A: (5, -8) B: (-2, -10)

C: (-6, -13) D: (-2, 1)

Line AB: 2/7  Line CD: 7/2

Neither

400

Are the Slopes of Line AB and Line CD Parallel, Perpendicular, or Neither

A: (-4, 7) B: (-2, 6)

C: (2, -2) D: (-8, 3)

Line AB: -1/2   Line CD: -1/2

Parallel

500

Are the Slopes of Line AB and Line CD Parallel, Perpendicular, or Neither

A: (0, -2) B: (0, 7)

C: (3, -5) D: (6, -5)

Line AB: Undefined   Line CD: 0

Perpendicular

Find x!

100

Given A(–5,9), B(5,4), C(–3,7) and D(x,1), find the value of x so that line AB and line CD are parallel.

x = 9

200

Given A(–2,7), B(3,5), C(4,1) and D(x,–5), find the value of x so that line AB and line CD are parallel.

x = 16

300

Given A(5,3), B(2,7), C(1,4) and D(x,8), find the value of x so that line AB and line CD are parallel.

x = -2

400

Given A(3,9), B(7,3), C(10,1) and D(4,x), find the value of x so that line AB and line CD are perpendicular.

x = -3

500

Given A(9,2), B(7,6), C(9,x) and D(1,5), find the value of x so that line AB and line CD are parallel.

x = 9

Vocabulary

100

What is the slope formula?

y₂ - y₁ / x₂ - x₁

200

What do we call lines that do intersect at a 90 degree angle?

What are perpendicular lines?

300

What is another word for Rise over Run?

What is Slope?

400

What do you call lines that go the same direction but never meet?

What are Parallel Lines?

500

A line with zero slope and a line with undefined slope are...?

What are perpendicular lines?