Can some workout this problem

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

X+ y = 5 ; x - y =3 solve using linear combination