Can someone check this for me? its easy

this is the assignment:
in your journal, give an example of a function. give the relation as a set of ordered pairs. use a test such as mapping or the vertical line test to show if your set of ordered pairs is a function. an example of a function could be: distance traveled and time, or the cost of a turkey and its weight. you can list your relation as a set of ordered pairs, or as a table. in either case, you must prove the relation is a function using one of the two tools given to you in the prior lessons.

this is what i put:
the function is the cost of a car vs. the amount of time it takes in hours.
the parts for the repair cost $150 than an ordered pair would be (0, 150). if the labor rate is $50/hr., then another order pair would be (1, 150), (2, 200), (3, 250) etc. every time, you increase the x-coordinate by 1, you increase the y-coordinate by 50. the relation would be a function because there will not be two different costs that take the same amount of time.