The difference between a number and three is multiplied by negative six. the result is eighteen. what is the number?

a. write an equation that can be used to find the number, n.
b. solve the equation you wrote in part a to find the value of the number. include all of your work in your answer.

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books