Tell whether (4,2) is a solution?

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

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17

Joanie watched 1 out of three of a movie in the morning