We can use the form of equation to choose the most convenient method to graph its line. If the equation has only one variable, it is a vertical or horizontal line. If y is isolated on one side of the...We can use the form of equation to choose the most convenient method to graph its line. If the equation has only one variable, it is a vertical or horizontal line. If y is isolated on one side of the equation, graph by plotting points. Choose any three values for x and then solve for the corresponding y- values. If the equation is of the form Ax + By = C, find the intercepts. Find the x- and y- intercepts and then a third point.