Mx y b m x y - b. Solution for Ymx b equation. Equation of a Straight Line The equation of a straight line is usually written this way.
From the y-intercept point use the slope to find a second point.
Rewrite the equation as mxb y m x b y. Pick any of the two given points. Y at which the the line crosses the y or vertical axis. In this equation we have m-25 and b25.