What can I expect to make on a test if I do no homework?

Homework Strike!!

In this lesson you will learn how to interpret the equation

of a linear model by calculating the y-intercept using the slope-

intercept equation.

Let’s ReviewLet’s Review

y=mx+ b

slope y-intercept

(x,y)

Let’s ReviewA Common Mistake

If x=3, y=4, and m=2Substitute:4=2(3)+b

4=23+b 4=6+b

Let’s ReviewCore Lesson

Homework completed

100

90

80

70

60

50

40

30

20

10

1 2 3 4 5 6 7 8 9 10

Test

sco

re

(2,30)

(8,90) Find the rate of change(slope) of the line

1

2 Substitute the m, x, & yinto the y=mx+b

3 Solve for b.

Let’s ReviewCore Lesson

m=90−308−2

=101

2 x

3

Homework completed

100

90

80

70

60

50

40

30

20

10

1 2 3 4 5 6 7 8 9 10

Test

sco

re

(2,30)

(8,90)

Let’s ReviewCore Lesson

I can expect a grade of 10 on my test if I don’t do any homework!

I better get started on my homework!

In this lesson you learned how to interpret scatter plots by finding the y-intercept using the slope-intercept equation.

Let’s ReviewGuided Practice

Study Time (min)

Resp

on

se S

peed

(se

c)

100

90

80

70

60

50

40

30

20

10

1 2 3 4 5

Find the y-intercept using the slope-

intercept equation of the line of best fit.

Let’s ReviewExtension Activities

Find a data table in your local newspaper that compares two pieces of data. Construct a scatter plot using the data found. Informally draw the line of best fit. Find the y-intercept for this data using the slope-intercept equation of a line. Explain what the y-intercept represents within the context of the problem.

Let’s ReviewExtension Activities

Survey 10 people and construct your own scatter plot with the results. Informally draw the line of best fit. Use this line to find the y-intercept for this set of data using the slope intercept equation of the line. State the meaning of this y-intercept within the context of the problem.

Let’s ReviewQuick Quiz

Determine the y-intercept of the line of best fit using the slope-intercept equation of a line.

Side length of a square

100

90

80

70

60

50

40

30

2010

1 2 3 4 5 6 7 8 9 10

Peri

mete

r of

a s

quare

Let’s ReviewQuick Quiz

Find the y-intercept using the slope-intercept equation and line of best fit. What does the y-intercept mean for this graph?

Minutes at Lunch

Food

Rem

ain

ing

(ou

nce

s)

25

20

15

10

5

4 8 12 16 20