Question 853534
Please see the following articles:
https://en.wikipedia.org/wiki/Linear_equation
https://en.wikipedia.org/wiki/Slope


and do an internet search for an application of a linear equation (e.g. cell phone pricing, highway/railroad grade, taxicab pricing). As you should know, we are not here to do your homework, that is, I am not going to write 3/4 - 1 page on it.