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?

Brock is a plumber He charges a flat rate of 40 to visit a house to inspect its plumbing He charges an additional 20 for every hour he spends inspecting or maki class=