Ax + By = C Now, the Standard Form of the equation of a line is: Ax + By = CThe slope of this line is (-A/B) [note: convert to slope-intercept form, y=mx+b, to verify this] The two points (-8,0) and (1, 5) have a slope ("rise over run") of (5-0)/(1-(-8)) = 5/9. The line has the equation : 5x - 9y = D [we need a point to find D] 5(-8) - 9(0) = D -40 = DThe equation of the line, in Standard Form, is: 5x - 9y = -40