Answer
Using three points is a good idea since third point serves as a way to check if the first two points' coordinates are accurate.
Work Step by Step
Using three points to graph a linear equation allows you to have a more accurate graph. The third point will serve as a way to check if the first coordinates of the first two points were accurately solved.
$\\\\$Also, if the first two points used are the x and y-intercepts, and the intercepts happen to be the point of origin, a third point will allow you to have two different points that you can connect to complete the graph.
