Study Guide And Review Math Worksheet With Answer Key - Chapter 4 Page 7
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9ANSWER:
ANSWER:
Study Guide and Review - Chapter 4
y = 2x − 6
y = 210x + 230
48. ATTENDANCE A scatter plot of data compares
50. MOVIES The table shows ticket sales at a certain
the number of years since a business has opened and
theater during the first week after a movie opened.
its annual number of sales. It contains the ordered
Write an equation of the regression line. Then
pairs (2, 650) and (5, 1280). Write an equation in
estimate the daily ticket sales on the 15th day.
slope-intercept form for the line of fit for this
situation.
SOLUTION:
Find the slope of the line containing the given points.
SOLUTION:
Use a calculator to find the equation of the
regression line.
Use the slope and either of the two points to find the
y-intercept.
y = −5.79x + 99.14
To estimate the daily ticket sales on the 15th day,
evaluate the regression equation for x = 15.
Write the equation in slope-intercept form for the line
of fit.
ANSWER:
y = 210x + 230
50. MOVIES The table shows ticket sales at a certain
theater during the first week after a movie opened.
Write an equation of the regression line. Then
estimate the daily ticket sales on the 15th day.
The daily ticket sales on the 15th day after a movie
opens is $12.29.
ANSWER:
y = −5.79x + 99.14; $12.29
SOLUTION:
Use a calculator to find the equation of the
Find the inverse of each relation.
regression line.
52. {(1, 9), (13, 26), (–3, 4), (–11, –2)}
SOLUTION:
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Page 7
To find the inverse, exchange the coordinates of the
ordered pairs.
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