Equation that would have infinitely many solutions with 5x+3y=12

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

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

What is the equation of a line passing through (-6,5) and having a slope of 1/3