You can either find it in 2 ways. (1) pick 2 coordinates and find the slope by solving for y1-y2 divided by x1-x2. way number 2 is (2) by counting the spaces. slope is rise over run, so we can see the the coordinate went down 1, which is negative one. and it went 1 space to the right. so by setting up the equation, it would be -1/1, which equals negative 1. message me if u have a problem, kinda hard to explain it in words.
That means what is the least u would spend and most so like if someone asked you how much you would pay for a product, you may say $7-$10 and 7 would be the low range and 10 would be the high range
