Question 1066443
Fee=80+32x, where x=number of hours. Units are dollars.  The constant 80 is the fee that doesn't change per hour worked.  The slope is the number in front of the x and here is $32 for every 1 hour. The hours are able to be determined, and they are called the independent variable. The cost is the dependent variable, depending upon hours worked, and that is on the y-axis by convention, whereas the independent variable is on the x-axis by convention.
Just coming out costs $80.
y-intercept is where x=0, and it is at (0,80)
The x-intercept is where y=0, and that is at -2.5.  In these kinds of problems, the intercept may not make sense, but that is OK. The value of the x-intercept has no meaning to the electrician.
{{{graph(300,300,-10,10,-10,200,32x+80)}}}