15.) Mr. Ayala quiere comprar 10 carpetas que cuestan $7 cada una, pero tienen un descuento x. El solo tiene $50 para gastar. Resuelve esta desigualdad: 1067 - x) s 50, luego explica tu respuesta.​

Can someone explain the elimination method to me for this problem?

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

Find the maximum value of p= 4x + 5y subject to the following constraints :