Please help ASAP: Factorise the following

Aportion of a line bounded by two points is defined as

It takes a total of 6 hours to fill up an inground backyard pool using a standard house. a function can represent this situation to represent the amount of water in the pool until it is full a function of time the hose is running. determine the domain for the function

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