Bob has some 10 lb weights and some 3 lb weights. together, all his weights adds up too 50lbs. if x represents the number of 3lbs and y represents the number of 10 lbs, which equation can be used to find te number of each type of weight bob has? a: 3x-10y=50 b: 3x=50-10y c: 50+10y=3y or d: 50+3y=10y

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