February 25, 2019

Lesson #6 - Parallel and Perpendicular Lines

By the end of this lesson I will be able to determine if lines are parallel or perpendicular.

Learning Goal

Kahoot

https://create.kahoot.it/kahoots/my-kahoots

Rise

Run

Parallel Lines Have the same ( ).

Are y=3x + 4 and y=3x parallel lines?

Are y=-2x -1 and y=2x + 4 parallel lines?

Write the equation of a line that is parallel to the line y=-½x + 3.

February 25, 2019

Are the following lines parallel?

X Y

0 7

1 10

2 13

X Y

0 22

1 25

2 28

/slopes

/slopesPerpendicular Lines • have negative reciprocal slopes.• You flip the slope and change the sign.

What slope is perpendicular to the slope of:

a) 3

b) 2/5

c) -7

d) 0

• A slope of 3/2 has a perpendicular slope of - 2/3. • A slope of -3 has a perp slope of 1/3.

February 25, 2019

Write the equation of the line that is perpendicular to:

a) y = 9x -1

b) y = - 6 x + 37

Text p.125-127 #6-9, 13,14(use Desmos on your iPad/phone/computer for #13)