Learn how to plot coordinates and create straight line graphs to show the relationship between two variables. Also, plot graphs that contain a negative coefficient of x.

Quadratic equations are polynomials that include an x², and teachers use them to teach students to find two solutions at once ... So x + 4 is an expression describing a straight line, but (x + 4)² is ...

The line of best fit is an output of regression analysis that represents the relationship between two or more variables in a dataset.