1. Lesson 8.3 (part 1) Slope

2. Slope is the ratio that describes the tilt or slant of a line
If a line slants up from left to right, it has a positive slope.
If a line slants down from left to right, it has a negative slope.

3. Slope formula Slope = rise vertical change run horizontal change
Find the slope of the line shown in this graph.

4. Your turn
Just by looking tell if the line has a positive or negative slope.
Then use the slope formula to find the slope of this line.

5. If you know 2 points on a line you can calculate the slope another way.
y2 – y1
This is also known as slope =
x2 – x1

6. Find the slope of the line through each pair of points.

7. Special Slopes Horizontal and Vertical Lines

8. Practice a few
Find the slope of each line.

9. Practice Find the slope of the line through E(7, 5) and F(-2, 0).
Find the slope of this line.

10. Tonight’s Assignment Lesson 8.3 (page 414)
# 1-10 all, 21, 23, 24, all