Select the correct answer.
Brock is a plumber. He charges a flat rate of $40 to visit a house to inspect it's plumbing. He charges an additional $20 for every hour he spends inspecting or making repairs.
Which graph below correctly shows the price of using Brock's plumbing service vs time?
graphs of price vs time
A.
Graph W
B.
Graph X
C.
Graph Y
D.
Graph Z