A plumbing company installs tankless hot water heaters and

charges for both installation time and materials used.

1. The heater and supplies cost $1 800 and the shop charges

$110/h for a plumber and an apprentice. Write a equation to

represent the total cost to the customer. Be sure to state what

each variable represents.

1. What is the slope of the relation?

What is the vertical-axis intercept of the relation?

1. Sketch the graph of the relation.

1. If the installation takes 2 hours, how much will the customer be charged?

1. If a customer was charged $2 185, how long did the installation take?