1. Slope-intercept form

2. objective
Students will be able to use slope intercept form.

3. Slope-intercept form of a line
A line can be written in the form y = mx + b m = slope b = y-intercept (where the line crosses the y axis)

4. putting equations in slope intercept form
Slope Intercept Form : y = mx + b
Solve for y.
y should always be positive.
Make sure your slope is after the equal sign.
The number by itself should be last.
If there is a missing part, you can fill in zero.

5. Examples
a) 1 + y = x b) 0 = -8x + 5y – 20 c) 5 + 6x = 5y d) y = x

6. To Graph
To graph y = mx + b
Plot the y-intercept on the graph first
From there, use the slope to find other points

7. Find slope and y-intercept and graph
a) y = 3 4 x b) y = -5x + 3

8. Writing slope intercept form given (m) and (b)
a) m = 7, b = b) m = , b = 9

9. Slope intercept for when given two coordinates
Steps:
Use the points to find the slope (m)
Use the slope and one of the coordinates to solve for the y-intercept (b).
Put the slope and y-intercept into the equation y = mx + b.

10. examples
a) (3,5), (0,4) b) (-1,3), (-3,1) c) (3,2), (-1,6)

11. Homework