Chapter 12: Q.12.2 (page 681)
Is the following an example of a linear equation? Why or why not?

Short Answer
The given figure (or graph) is not an example of linear equation because the graph is curved and not a straight line.
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Chapter 12: Q.12.2 (page 681)
Is the following an example of a linear equation? Why or why not?

The given figure (or graph) is not an example of linear equation because the graph is curved and not a straight line.
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The maximum discount value of the Entertainment庐 card for the 鈥淔ine Dining鈥 section, Edition ten, for various pages is given in Table 12.21.

a. Decide which variable should be the independent variable and which should be the dependent variable.
b. Draw a scatter plot of the ordered pairs.
c. Calculate the least squares line. Put the equation in the form of: \(\hat{y}=a+bx\)
Solve.
a. When
b. When
c. When Why doesn鈥檛 this answer make sense
Due to erosion, a river shoreline is losing several thousand pounds of soil each year. A linear equation that expresses the total amount of soil lost per year is .
How many pounds of soil does the shoreline lose in a year?
The following table shows data on average per capita coffee consumption and heart disease rate in a random sample of \(10\) countries.

a. Enter the data into your calculator and make a scatter plot.
b. Use your calculator鈥檚 regression function to find the equation of the least-squares regression line. Add this to your scatter plot from part a.
c. Explain in words what the slope and y-intercept of the regression line tell us.
Use the following information to answer the next five exercises. A random sample of ten professional athletes produced the following data where is the number of endorsements the player has and is the amount of money made (in millions of dollars).
| x | y | x | y |
| 0 | 2 | 5 | 12 |
| 3 | 8 | 4 | 9 |
| 2 | 7 | 3 | 9 |
| 1 | 3 | 0 | 3 |
| 5 | 13 | 4 | 10 |
What is the y-intercept of the line of best fit? What does it represent?
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