(a)
The variables in the graph and the relation of variables at various points on the graph are to be determined.
(a)

Explanation of Solution
The graph given in the question is,
The graph is between length and time.
The given graph represents the variation of length of a board with time. The time is plotted on the x-axis while length is plotted on the y-axis.
The variables in the graph are length and time.
The length of the board remains constant over a shot time interval and as the length keeps on decreasing the time interval in which the length of the board remainsconstant,increases.
The variation of length of board in the different timeinterval is shown below:
After a time interval (t3-t2) the length of the board remains constant with respect to time.
(b)
The variables in the graph and the relation of variables at various points on the graph are to be determined.
(b)

Explanation of Solution
The graph given in the question is,
The given graph represents the cell phone cost of June month with respect to minutes of calls.
The variables are cost and minutes of calls.
The graph represents that the cell phone cost is fixed up to half month of June with respect to number of calls and the cost starts to rise linearly in the rest of the month with respect to minutes of calls.
Chapter 4 Solutions
High School Math 2011 Algebra 1(prentice Hall) Student Edition
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