Please answer all of them
thank you I'll mark brainlist

Me with this one question, and i'll upvote the brainliest answer

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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