Evaluate the expression 43/4 is it the base?

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

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.

Which of the following equations is equivalent to x/3-6/x=1