Since the slope of a horizontal line is 0 the general formula for the standard form equation y mx b becomes y 0x b y b. Suppose we pick the point 7 4left - 74 right 7 4. -10 -1 0.
Y when x0 see Y Intercept y how far up.
When you rearrange this equation to get y by itself on the left side it takes the form y mx b. This y-value is therefore also the y-intercept. So all you really need to get from point-slope form to slope-intercept form is a little algebraic manipulation. The standard form of such an equation is Ax By C 0 or Ax By C.