1. Slope-Intercept Form
Section 5-3 Part 2

2. Goals Goal Rubric To graph linear equations in slope-intercept form.
Level 1 – Know the goals.
Level 2 – Fully understand the goals.
Level 3 – Use the goals to solve simple problems.
Level 4 – Use the goals to solve more advanced problems.
Level 5 – Adapts and applies the goals to different and more complex problems.

3. Vocabulary
None

4. Steps for Graphing y = mx + b
You can use the slope and y-intercept from a linear equation in slope-intercept form to graph a line
Graphing y = mx + b by Using the Slope and y-Intercept
Plot the y-intercept on the y-axis. This is the point (0, b).
Obtain a second point using the slope, m. Write m as a fraction, and use rise over run starting at the y-intercept to plot this point.
Use a straightedge to draw a line through the two points. Draw arrowheads at the ends of the line to show that the line continues indefinitely in both directions.

5. Example: Graph the line given the slope and y-intercept.•
Rise = –2 •
Step 1 The y-intercept is 4, so the line contains (0, 4). Plot (0, 4). • •
Step 2 Slope = Count 2 units down and 5 units right from (0, 4) and plot another point.
Run = 5
Step 3 Draw the line through the two points.

6. Example: Graph the line given the slope and y-intercept.
slope = 4; y-intercept =
Run = 1
Rise = 4
Step 1 The y-intercept is , so the line contains (0, ). Plot (0, ). •
Step 2 Slope = Count 4 units up and 1 unit right from (0, ) and plot another point. •
Step 3 Draw the line through the two points.

7. Your Turn: Graph the line given the slope and y-intercept.
slope = 2, y-intercept = –3
Step 1 The y-intercept is –3, so the line contains (0, –3). Plot (0, –3).
Run = 1
Rise = 2
Step 2 Slope =
Count 2 units up and 1 unit right from (0, –3) and plot another point. • •
Step 3 Draw the line through the two points.

8. Your Turn: Graph each line given the slope and y-intercept.
slope = , y-intercept = 1
Step 1 The y-intercept is 1, so the line contains (0, 1). Plot (0, 1).
Rise = –2 •
Step 2 Slope = Count 2 units down and 3 units right from (0, 1) and plot another point. •
Run = 3
Step 3 Draw the line through the two points.

9. Your Turn:
Run 3
y-intercept
b = -1
Rise 2
slope

10. Your Turn:
Run 2
y-intercept
Rise
b = 3 -1
slope

11. Your Turn:
Run 1
y = 2x + 1
y-intercept
Rise
b = 1 2
slope
m = 2

12. Your Turn:
Run 1
y = -3x + 2
y-intercept
Rise
b = 2 -3
slope
m = -3

13. Joke Time What do calendars eat? Dates!
Why couldn’t Dracula’s wife get to sleep?
Because of his coffin!
What do you call a psychic midget who has escaped from prison?
A small medium at large!

14. Assignment
5-3 Part 2 Exercises Pg : #4 – 38 even