How can we write the domain and range for a function that is not piece- wise such as y=x

An equation where variables are used to represent known values—function notation true or false

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.

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?