Which set of ordered pairs represents a function

Need on this geometry question. explain how you did it.

Reflect the point (7,0) across the y-axis

Tony is charged $ 50 and additional $0.15 per miles for renting a car. a) represent the cost of renting a car with an equation, and the determine the cost if he drove it70 miles. b) what would be the cost of a car rental if the car was driven 250 miles? show work