2 - 23 b. The slope intercept form is y mx b. Vertical lines are thought of as having no slope.
Write the equation in slope-intercept form y.
The one thing that is true about vertical lines is that the x value is constant. Calculate the slope from the y-intercept to the second point. The one thing that is true about vertical lines is that the x value is constant. Where m is the slope of the line and b is the y-intercept.