410−x/7 +70=120. please answer fast i will give brainliest

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Find the values of y: 3y^3(y^2+ 2/3y)=0

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