1. 5-4 point-slope form

2. Point-slope form of a line
A line can be written in the form y – y1 = m(x – x1) m = slope (x1, y1) = point on the line

3. Point-slope form
When putting points in point-slope form or taking them out, the signs of x and y will change.
y – 7 = 4(x – 9) (-3, 5) m = 6

4. Examples
Write an equation in point-slope form. a) (3,-4) m = 6 b) (4,2) m = - 5 3

5. Example
Write an equation in point-slope form. a) (1,4) (-1, 1) b) (2,4) (-3, -6)

6. example
Graph.
a) y + 3 = 2(x – 1) b) y + 5 = (x + 2)

7. homework
Page 151
1-13 all