Question

linear relationship word problems: foundations
ben frank is an electrician who installs lighting fixtures. he charges his clients 15h + 40f dollars, where h is the number of hours worked and f is the number of fixtures installed. what is the amount, in dollars, ben frank charges when he works 7 hours and installs 9 fixtures?
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Explanation:

Step1: Substitute values of h and f

Given the formula $15h + 40f$, substitute $h = 7$ and $f=9$. So we get $15\times7+40\times9$.

Step2: Calculate the first - product

$15\times7 = 105$.

Step3: Calculate the second - product

$40\times9=360$.

Step4: Calculate the sum

$105 + 360=465$.

Answer:

465