Pls help this is due today

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Bill works as a waiter and is keeping track of the tips he ears daily. about how much does bill have to earn in tips on sunday if he wants to average $22 a day? tips by day tips (dollars) monday tuesday wednesday thursday friday saturday $14 $22 $28 $36

Find the values of y: 3y^3(y^2+ 2/3y)=0