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The Ultimate Slope/Y-intercept Handbook

by Mary Foster

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THE ULTIMATE
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Slope/Y-intercept
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Handbook
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By Mary Foster
Arkanasas State Standard
HSS.ID.C.7: Interpret the slope (rate of change) and the intercept (constant term) of a linear model in the context of the data
Car Wash
Lets say you and a friend are going to start a car wash to make money. You have to buy some supplies first, totaling about $100. Then, you want to charge $5 per car wash. Lets make a chart showing how much money P, you would profit from washing x cars.
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CAPTION Half page image nullam nunc eros, vehicula feugiat
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CAPTION Half page image nullam nunc eros, vehicula feugiat
Why do you think that the profit is negative before you start washing cars?
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So what is the slope and what does it mean?
So what IS the rate of change?? 
In this table, I have highlighted the things that are changing in yellow and the things that are not changing in RED.
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The SLOPE is defined as the RATE OF CHANGE
 
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