Answer: Part a: b represents the base fee charged for the "house call" job
m is the hourly rate.
x is the number of hours at the job.
y represents the total cost for the job.
Part b:. The y-intercept is 65
The equation follows y=mx+b
Y= 42x + 65
Part c:. $275
Step-by-step explanation:
The difference between the two total costs, (Camilla 191 - Connor 107)
= $84. That is the rise. The run is the difference in time, 2 hours. 84/2 = 42.
m= 42
42 from 107 to find b, the base fee, 65 This is the y-intercept.
The equation is y= 42x + 65
Quick check using Camilla's bill: 191 = (42)(3) + 65
191 = 126 + 65 True!
Part C:
To find the total cost of the plumber's 5 hour job,
Y = 42(5) + 65
Y= 210 + 65
Y= $275
