Can someone help me with this?

Which term best describes the association between variables a and b

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

Graph the equationy= x+3[tex]y = x + 3[/tex]