The slope of a VERTICAL line however is UNDEFINED. Substitute the slope for m in the slope intercept form of the equation. ϕ b a so that the slope of the line is m tanth tanpϕ tanϕ b a.
Y m x b.
Also the y -intercept is b. When the line is graphed m is the slope of the line and b is where the line crosses the y-axis or the y-intercept. The equation of the line in slope-intercept form is equal to. A coordinate plane showing Greeting Card Revenue Number of Cards Sold on the x-axis and Revenue in dollars on the y-axis.