Question 1113892
(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),    {{{highlight(C=30t+80)}}}


(b), How much time if C=140?
Just Let C=140 and solve for t.
{{{30t+80=140}}}------YOU solve this!