21
Finding Equations From Graphs and Real Life Situations
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
