which property of operations could be used to write the equivalent expression for y + 1/2 pls i will give brillants and 5 star and a thanks

Two lines that do not intersect are skew. always sometimes or never

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.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15