If an equation can be rearranged into the form \(y = mx + c\), then its graph will be a straight line. In the above: \(x + y = 3\) can be rearranged as \(y = 3 - x\) (which can be re-written as \(y = ...

You can make an Excel scatter plot assigning one of the variables in each record to the x-coordinate and one to the y-coordinate on a standard graph axis. Each point will then be plotted as a ...