Answer
(a)
Function of a linear graph is given by
\[f\left( x \right)=47x+22\]
The function \[f\left( x \right)\] is in the form of \[y=mx+c.\]
Slope of the function is 47.
On an average, amount spent is increased by 47 per hour spent in the mall.
This means that for each additional hour spent at a shopping mall, the average amount spent increases by \[\$47\] per hour.
Slope of the function is \[47\]. This means that for each additional hour spent at a shopping mall, the average amount spent increases by \[\$47\] per hour.
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