In order to solve the following system of equations by subtraction what of the following could you do before subtracting the equations so that one variable will be eliminated when you subtract them

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

What is the distance between the points (2, 5) and (5,9)?

Vertical angles must check all that apply