Lesson 7
Translating to $y=mx+b$
Problem 1
Select all the equations that have graphs with the same \(y\)-intercept.
\(y=3x -8\)
\(y=3x -9\)
\(y=3x+8\)
\(y=5x -8\)
\(y=2x -8\)
\(y=\frac13x -8\)
Solution
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Problem 2
Create a graph showing the equations \(y=\frac14x\) and \(y=\frac14x-5\). Explain how the graphs are the same and how they are different.
Solution
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Problem 3
A cable company charges $70 per month for cable service to existing customers.
- Find a linear equation representing the relationship between \(x\), the number of months of service, and \(y\), the total amount paid in dollars by an existing customer.
- For new customers, there is an additional one-time $100 service fee. Repeat the previous problem for new customers.
- When the two equations are graphed in the coordinate plane, how are they related to each other geometrically?
Solution
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Problem 4
A mountain road is 5 miles long and gains elevation at a constant rate. After 2 miles, the elevation is 5500 feet above sea level. After 4 miles, the elevation is 6200 feet above sea level.
- Find the elevation of the road at the point where the road begins.
- Describe where you would see the point in part (a) on a graph where \(y\) represents the elevation in feet and \(x\) represents the distance along the road in miles.
Solution
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(From Unit 5, Lesson 5.)Problem 5
Match each graph to a situation.
![4 graphs of lines labeled A, B, C. D.](https://cms-im.s3.amazonaws.com/P8yWfXWNRf1UAdXU376YHsd3?response-content-disposition=inline%3B%20filename%3D%228.3.B6.PP.match11.png%22%3B%20filename%2A%3DUTF-8%27%278.3.B6.PP.match11.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF3XOEFOW4%2F20240718%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240718T033608Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=cc66753eb79d6fb266d03b7fc4d94633d4e7f59041a1096522fa3f1d77e35a59)
Solution
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(From Unit 5, Lesson 5.)