Can someone help me with this. Will Mark brainliest. Need answer and explanation/work. Thank you.

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

Pls never taught i’m really confused and i rlly need

Which graph represents the linear function below? y-4= (4/3)(x-2)