Equations of Straight Lines Depending upon the given information, equations of lines can take on several forms:Slope Intercept Form: y = mx + b Use this form when you know, or can find, the slope, m, and the y-intercept, b.Point Slope Form: y - y1 = m(x - x1) Use this form when you know, or can find, a point on the line (x1, y1), and the slope, m.Standard … [Read more...] about Equations of Straight Lines