I was given the answer, but was confused of how it got to there—please help!

Through non-collinear points there is exactly one plane.

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

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