Finding Equations From Graphs and Real Life Situations

Get warmed up…

Is the slope:

a) Positive b) negative c) zero d) no slope

Get warmed up…

Is the slope:

a) Positive b) negative c) zero d) no slope

Get warmed up…

Is the slope:

a) Positive b) negative c) zero d) no slope

Get warmed up…

Is the slope:

a) Positive b) negative c) zero d) no slope

Challenge #1

Find the Equation from a Graph

#1

A)What is the y-intercept (b)?B) What is the slope (m)?

C) What is the equation of the line?

a) Y = 2x

b) Y = .5x + 1

c) Y = 2x + 1

#2

A)What is the y-intercept (b)?B) What is the slope (m)?

C) What is the equation of the line?

a) Y = -2x -1

b) Y = .5x - 1

c) Y = 2x - 1

#3

A)What is the y-intercept (b)?B) What is the slope (m)?

C) What is the equation of the line?

a) Y = 1x +2

b) Y = 2x

c) Y = 2

#4

A)What is the y-intercept (b)?B) What is the slope (m)?

C) What is the equation of the line?

a) Y = 3x - 1

b) Y = .33x - 1

c) Y = -.33x - 1

#5

A)What is the y-intercept (b)?B) What is the slope (m)?

C) What is the equation of the line?

a) Y = 3x + 2

b) Y = -3x + 2

c) Y = .33x

How to make an equation from a graph

Challenge #2

Find the equation of a real life situation

#1

A)What is the y-intercept (b)?B) What is the slope (m)?

C) What is the equation?

a) Y = 20x

b) Y = -20x + 0

c) Y = x + 20

Derek started with no money in his bank account, but he just got a job mowing lawns and he gets $20 a week. He puts all of it in his account. How much money will he have in his account in x weeks?

#2

C) What is the equation?

a) Y = 120x + 5

b) Y = 120 + 5

c) Y = -5x + 120

Rosa has a bank account with $120 in it and she takes out $5 a week. How much money will she have in her account in x weeks?

#3

C) What is the equation?

a) Y = 39x

b) Y = 39x + 0.01

c) Y = 0.01x + 39

Frank has an iphone. The iphone costs $39 a month plus $0.01 a minute. What is the equation for his monthly bill?

#4

C) What is the equation?

a) Y = 100x + 6

b) Y = 6x + 100

c) Y = 106x

David was raising money for the school in a walkathon. He got $100 pledged no matter what plus $6 for every mile he walked. What is the equation for how much money he will make?

Challenge Problem

What is the slope of a line that passes through (7,1) and (6,5)?

Do you feel like you can find an equation from a graph or situation?

1-3

1: still confused 2: getting the idea but a little unsure 3: got it.

Now try it on your own!

Linear Equations #1-14Time: 15 minutes

• Solve each problem in any order• Click in your answer• If a number shows up instead of a letter just make

sure the number and letter are on the same button and then send

• You can skip ahead or change answers to past problems by using the arrow keys

• When done: work on challenge sheet (for this

you will need to use a pencil)

14131211109 8 7 6 5 4 3 2 1 O