You saw in the last chapter that linear graphs and equations are used to describe a variety of real-life situations. In mathematics, the goal is to find an equation that explains a situation as presented in a problem. In this way, we can determine the rule that describes the relationship. Knowing the equation or rule is very important since it allows us to find the values for the variables. There are different ways to find the best equation to represent a problem. The methods are based on the information you can gather from the problem.
This chapter focuses on several formulas used to help write equations of linear situations, such as slope-intercept form, standard form, and point-slope form. This chapter also teaches you how to fit a line to data and how to use a fitted line to predict data.