1. Represents a given point on the line.
Point-Slope Form: y – y1 = m (x – x1 )
Explanation: ( x1 , y1 ) m
( x , y )
*cannot be used with vertical lines*
1. Write an equation in point-slope form of the line that passes thru ( 1 , -3 ) with a slope of -4.
2. Write answer from #1 in slope-intercept form. (Solve for y)
Represents a given point on the line.
is the slope (either given or calculated).
Represents some other point on the line.

2. 3. Write an equation in pt-slope form what passes through ( 2 , 3 ) with a slope of –½ .
4. Write #3 in sl-int form.
5. Write an equation in pt-slope form that passes thru ( -3 , 6 ) and ( 1 , -2 )
6. Write #5 in sl-int form