What is the missing pattern ?

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

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

What is the anwers for 9+2x=5x-3-x