
Concept explainers
a.
To draw:
A coordinate plane for each column, and graph the equations in the column on that plane.
a.

Explanation of Solution
Given:
You use a combination of running and walking to complete a race dmiles long. Your running speed is r miles per hour and your walking speed is w miles per hour. Let x be your running time and let y be your walking time (both in hours). Then
The table below shows equations of the form
Calculation:
Upon graphing the equation in 1st column, we will get our required graph as:
Upon graphing the equation in 2ndcolumn, we will get our required graph as:
Upon graphing the equation in 3rdcolumn, we will get our required graph as:
b.
What happens to the graph of
b.

Answer to Problem 32E
The graph of
Explanation of Solution
Given:
You use a combination of running and walking to complete a race dmiles long. Your running speed is r miles per hour and your walking speed is w miles per hour. Let x be your running time and let y be your walking time (both in hours). Then
The table below shows equations of the form
Calculation:
Upon looking at the graph of equations in 1st column, we can see that graph of
c.
What happens to the graph of
c.

Answer to Problem 32E
The graph of
Explanation of Solution
Given:
You use a combination of running and walking to complete a race dmiles long. Your running speed is r miles per hour and your walking speed is w miles per hour. Let x be your running time and let y be your walking time (both in hours). Then
The table below shows equations of the form
Calculation:
Upon looking at the graph of equations in 2nd column, we can see that the y -intercept of the graph of
d.
What happens to the graph of
d.

Answer to Problem 32E
Thegraph of
Explanation of Solution
Given:
You use a combination of running and walking to complete a race dmiles long. Your running speed is r miles per hour and your walking speed is w miles per hour. Let x be your running time and let y be your walking time (both in hours). Then
The table below shows equations of the form
Calculation:
Upon looking at the graph of equations in 3rd column, we can see that the graph of
Chapter 8 Solutions
Pre-Algebra
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