How to solve 2x+3y=20 and -2x-3y=-20 by using elimination ?

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.

What is the prime factorization of 230

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x