I require assistance

Will give big brain award

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

(x-5)1/2+5=2 what is a possible solution?

Yvaries inversely as x. y =12 when x=5. find y when x=4