1. Section 8.3 Slope and y-intercept
Algebra Concepts
Section 8.3
Slope and y-intercept

2. When you go skiing, what does slope refer to?

3. Slope= 𝑣𝑒𝑟𝑡𝑖𝑐𝑎𝑙 𝑐ℎ𝑎𝑛𝑔𝑒 ℎ𝑜𝑟𝑖𝑧𝑜𝑛𝑡𝑎𝑙 𝑐ℎ𝑎𝑛𝑔𝑒

4. Slope-ratio that describes the tilt of a line

5. Positive slope= 𝑟𝑖𝑠𝑒 𝑟𝑢𝑛
Rise 1st Run 2nd

6. Negative slope= 𝑓𝑎𝑙𝑙 𝑐𝑟𝑎𝑤𝑙
Fall 1st Crawl 2nd

9. http://www. youtube. com/watch

10. Find slope of a line Pick two points on the line
Start at the left most point
Count spaces to rise (+) or fall (-)
Count spaces to run or crawl (always positive)

11. slope= 𝑟𝑖𝑠𝑒 𝑟𝑢𝑛 = 5 3

12. slope= 𝑓𝑎𝑙𝑙 𝑐𝑟𝑎𝑤𝑙 = −11 6

13. Finding the slope of a line using two points on the line
𝑠𝑙𝑜𝑝𝑒= ∆𝑦 ∆𝑥
3−(−1) 4−(−2)
4 6 = 2 3

14. Find the slope of the line containing these two points
#1 5,−2 𝑎𝑛𝑑 2,1 #2 7,8 𝑎𝑛𝑑 (4,10)

15. Real life slopes A unit cost can be written as a slope
$2 per pound has a slope of 2
35 miles per hour has a slope of 35

16. Assignment #50A
Worksheet

17. Y-intercept-point where a line crosses the y-axis

20. Graphing a line

21. Find the slope and y-intercept
#1 𝑦= 4 5 𝑥−3 #2 𝑦=− 1 3 𝑥+5 #3 𝑦=6𝑥+2 #4 𝑦=𝑥−3 #5 𝑦=− 5 2 𝑥

22. To graph Plot the y-intercept
From that point, use the slope to move to a new point
Plot the second point
Draw the line
Add arrows
𝑦= 3 5 𝑥−2

23. If a line is not in slope intercept form, solve the equation for y using algebra. #1 3𝑥+4𝑦=20 #2 2𝑦+𝑥=8

24. Slope intercept rap

25. Assignment #50B
Pg. 402 #2,4-9,11-19 odd 45,46