An electrician charges a fee of $50 plus $35 per hour. Let y be the cost in dollars of using the electrician for x hours. Find the slope-intercept form of the equation. Solution EXPLANATIONS: First you need to know that $50 is a one time fee for the total charge. C(x) would represent the total charge of electrical charge. Secondly you need to know that there is $35 charge every hour. This rate tells you that this should be the independent variable. For example if you use 4 hours of electricity, you have to include 4hourx $35/hour =$140. But remember that no matter how much you use, you need to spend extra $50 fee. Therefore D must be the answer to get the total charge C(x) = 35x+50 .

1. An electrician charges a fee of $50 plus $35 per hour. Let y be the cost in dollars of using the
electrician for x hours. Find the slope-intercept form of the equation.
Solution
EXPLANATIONS: First you need to know that $50 is a one time fee for the total charge. C(x)
would represent the total charge of electrical charge. Secondly you need to know that there is
$35 charge every hour. This rate tells you that this should be the independent variable. For
example if you use 4 hours of electricity, you have to include 4hourx $35/hour =$140. But
remember that no matter how much you use, you need to spend extra $50 fee. Therefore D must
be the answer to get the total charge C(x) = 35x+50