Find the x-intercept of the graph of the equation: 4x + y = 3

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

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42

Can someone me with this? i’m not sure what to put for my equations.