To solve the problem we must know about the graphs.
The Watkins family should install a chlorine pool to be more cost-efficient.
How to compare to graphs?
To compare the two graphs we take a value on the x-axis and then measure the output of the two graphs. This can be done with the help of the graph or by substituting the value of x in the function to measure the output y.
As in the given graph, the x-axis denotes the year while the y-axis denotes the cost of maintaining the pool in that year.
If we compare the two of the given graph we will find the cost of maintaining a chlorine pool is less as compared to a salt water pool at x=10, therefore, after 10 years.
Hence, the Watkins family should install a chlorine pool to be more cost-efficient.
Learn more about Graph:
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