Lesson 8-4 Pages 387-391

Lesson 8-4 Pages 387-391

Slope

What you will learn!1. How to find the slope of a line.

SlopeSlope

What you really need to know!

Slope describes the steepness of a line.

Run

RiseSlope

What you really need to know!

Slope is the same for any two points on a straight line.

12

12

xx

yym

What you really need to know!

The slope is a set of directions of how to walk from one point on a line to the next point on the same line.

Example 1:

Find the slope of a hill that rises 30 feet for every horizontal change of 150 feet.

5

1

15

3

150

30

Example 2: Find the slope of the line.

(1,4)

(0,1)Run

RiseSlope

01

14

Slope

31

3Slope

Example 3: Find the slope of the line.

(-3,3) (3,1) Run

RiseSlope

33

13

Slope

3

1

6

2

Slope

Example 4: Find the slope of the line.

(-3,-3) (-2,-3)

Run

RiseSlope

23

33

Slope

01

0

Slope

Example 5: Find the slope of the line.

(2,-2)

(2,3)Run

RiseSlope

22

23

Slope

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Example 6:

Two highway routes connect City A and City B. The first route rises 4 yards vertically for every 30 mile stretch. The second route rises 8 yards for every 70 mile stretch. Which statement is true?

AAThe first route is steeper than the second The first route is steeper than the second

route.route.

BBThe second route is steeper than the first The second route is steeper than the first

route.route.

CC Both routes have the same steepness.Both routes have the same steepness.

DD You cannot determine which is steeper.You cannot determine which is steeper.

AAThe first route is steeper than the second The first route is steeper than the second

route.route.

BBThe second route is steeper than the first The second route is steeper than the first

route.route.

CC Both routes have the same steepness.Both routes have the same steepness.

DD You cannot determine which is steeper.You cannot determine which is steeper.

Page 390

Guided Practice

#’s 4-11

Pages 387-389 with someone at home and

study examples!

Read:

Homework: Pages 390-391

#’s 12-26 all

#’s 30-31

Page

742

Lesson 8-4

Homework: Pages 390-391

#’s 12-26 all

#’s 30-41 all