Plz explain and put clear labeld 24 points! asap

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?