SOLUTION: A plumber charges $80 for a service call plus $30 per hour. a. Find a linear function that represents the total daily charges C, in dollars, as a function of the time t, in hours

Question 1113892: A plumber charges $80 for a service call plus $30 per hour.
a. Find a linear function that represents the total daily charges C, in dollars, as a function of the time t, in hours, spent at a given location.
b. If the total charge was $140, how many hours did he work?

Answer by josgarithmetic(39615) (Show Source): You can put this solution on YOUR website!
(duplicate or almost same exact problem done a few hours ago)
(#1113839)

The description itself fits an application of a linear equation. There is no "work" or steps needed to form the equation.
Slope: 30, for 30 dollars per hour
Vertical Axis Intercept: 80, the number dollars minimum base price, Service Call
C: the cost which the plumber will charge
t: the time that the plumber works

(a),

(b), How much time if C=140?
Just Let C=140 and solve for t.
------YOU solve this!
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