Pre-Algebra

5-5 Coordinate Geometry 6/1/2010 Slope #27

Today’s Plan:

-Intro to slope video

-Slope practice

LT: I will identify the slope of a line.

LT: I will identify the slope of a line.

Entry Task:

What is the slope of a line?

What did you learn about slope in Science?

*TURN IN TEXTBOOKS

Pre-Algebra

5-5 Coordinate Geometry

Slope is a number that describes how steep a line is.

Pre-Algebra

5-5 Coordinate Geometry 6/1/2010 Slope #27

Today’s Plan:

-Intro to slope video

-Slope practice

LT: I will identify the slope of a line.

LT: I will identify the slope of a line.

Video

Pre-Algebra

5-5 Coordinate Geometry

The slope of a horizontal line is 0. The slope of a vertical line is undefined.

slope =vertical change

horizontal change= rise

run

slope = rise run

Pre-Algebra

5-5 Coordinate Geometry 6/1/2010 Slope #27

Today’s Plan:

-Intro to slope video

-Slope practice

LT: I will identify the slope of a line.

Slope is a number that describes how steep a line is. slope = rise

run

++

--

00

Undefined

Pre-Algebra

5-5 Coordinate Geometry

Additional Example 1A: Finding the Slope of a Line

Determine if the slope of each line is positive, negative, 0, or undefined. Then find the slope of each line.

A. XY

positive slope;

slope of XY = = –5–4

54

Pre-Algebra

5-5 Coordinate Geometry

Determine if the slope of each line is positive, negative, 0, or undefined. Then find the slope of each line.

B. ZA

negative slope;

slope of ZA = = ––1 2

12

Additional Example 1B: Finding the Slope of a Line

Pre-Algebra

5-5 Coordinate Geometry

Determine if the slope of each line is positive, negative, 0, or undefined. Then find the slope of each line.

C. BC

slope of BC is undefined

Additional Example 1C: Finding the Slope of a Line

Pre-Algebra

5-5 Coordinate Geometry

Determine if the slope of each line is positive, negative, 0, or undefined. Then find the slope of each line.

D. DM

slope of DM = 0

Additional Example 1D: Finding the Slope of a Line

Pre-Algebra

5-5 Coordinate Geometry

Try This: Example 1A

Determine if the slope of each line is positive, negative, 0, or undefined. Then find the slope of each line.

A. AB A

C

B

D

FE

HG

positive slope;

slope of AB = 1 8

Pre-Algebra

5-5 Coordinate Geometry

B. CD

slope of CD is undefined

Try This: Example 1B

Determine if the slope of each line is positive, negative, 0, or undefined. Then find the slope of each line.

A

C

B

D

FE

HG

Pre-Algebra

5-5 Coordinate Geometry

C. EF

slope of EF = 0

Try This: Example 1C

Determine if the slope of each line is positive, negative, 0, or undefined. Then find the slope of each line.

A

C

B

D

FE

HG

Pre-Algebra

5-5 Coordinate Geometry

D. GH

Try This: Example 1D

Determine if the slope of each line is positive, negative, 0, or undefined. Then find the slope of each line.

A

C

B

D

FE

HG

negative slope;

slope of GH = = ––1 3

13