How does this work I’m confused

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

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

How many solutions does the nonlinear system of equations graphed below have?