1. AIM:
What are Double Line Graphs?

2. Plant 1 received Nitrogen Fertilizer
REMEMBER WHEN
we had two plants
Plant 1 received Nitrogen Fertilizer
Plant 2 received none

3. Plant #1 has the fertilizer
Grew to height of
2 inches on day 2
4 inches on day 5
8 inches on day 10
10 inches on day 15
14 inches on day 20

4. Plant #2 has NO fertilizer
Grew to height of
2 inches on day 2
4 inches on day 5
7 inches on day 10
8 inches on day 15
9 inches on day 20

5. What is Predicting? Which plant grew better?
How could we analyze our Data?
Would setting up a LINE GRAPH be useful in our analysis?
What do we do first?

6. Plant 2 No fertilizer Plant #1 Has fertilizer Grew to height of
2 inches on day 2
4 inches on day 5
8 inches on day 10
10 inches on day 15
14 inches on day 20
Grew to height of
2 inches on day 2
4 inches on day 5
7 inches on day 10
8 inches on day 15
9 inches on day 20
You make the data table!

7. Table of Plant Days vs. Plant Height:
Plant 1 Plant 2
2 2
4 4
8 7
10 8
14 9
Day of Growth 2 5 10 15 20

8. What is Predicting?
Lets GRAPH THIS!

9. Step ONE: Draw your Axis
Y-axis
X-axis

10. Step TWO: Label Your X Axis:
Y-axis
Label the Days `
Days
X-axis

11. Step Three: Now Label Your Y Axis:16 14 12 10
Plant Height
in inches 8 6 4 2 `
Days
X-axis
X-axis

12. Step Four: Now Plot Your Points
Y-axis 16 14 12 10
Plant Height
in inches 8 6 4 2 `
Days
X-axis

13. Step FIVE: Now Draw Your Line
Y-axis 16 14 12 10
Plant Height
in inches 8 6 4 2 `
Days
X-axis

14. Step FIVE: Now Draw Your Line
Don’t forget to label your line!
Y-axis 16 14
Plant #1 12 10
Plant Height
in inches 8 6 4 2 `
Days
X-axis

15. WAIT!
What about plant #2?

16. Step FIVE: Now Draw Your Line
NOW REPEAT FOR PLANT #2 !!
Y-axis 16 14
Plant #1 12 10
Plant Height
in inches 8 6 4 2 `
Days
X-axis

17. PLANT #2: Plot your Points
Y-axis 16 14
Plant #1 12 10
Plant Height
in inches 8 6
Points for Plant #2 4 2 `
Days
X-axis

18. Line for Plant #2 PLANT #2: Draw Your Line Y-axis 16 14 Plant #1 12 10
Plant Height
in inches 8 6
Line for Plant #2 4 2 `
Days
X-axis

19. Label Plant #2 PLANT #2: Draw Your Line Y-axis 16 14 Plant #1 12 10
Plant Height
in inches 8 6 4 2 `
Days
X-axis

20. Plant Height for one Plant with Fertilizer, and One Plant Without
Y-axis 16 14
Plant #1 12 10
Plant #2
Plant Height
in inches 8 6 4 2 `
Days
X-axis
LASTLY: TITLE YOUR GRAPH

21. Days of Plant Growth vs. Plant Height for Two Plants
Y-axis 16 14
Plant #1 12 10
Plant #2
Plant Height
in inches 8 6 4 2 `
Days
X-axis
Alternative Title for the Graph

22. (X vs Y): Days of Growth Vs. Plant Height
Y-axis 16 14
Plant #1 12 10
Plant #2
Plant Height
in inches 8 6 4 2 `
Days
X-axis
Alternative Title for the Graph

23. What would the plant height be of plant 2 on day 7
What is Predicting?
Based upon YOUR graph
What would the plant height be of plant 2 on day 7

24. (X vs Y): Days of Growth Vs. Plant Height
Y-axis 16 14
Plant #1 12 10
Plant #2
Plant Height
in inches 8 6 4 2 `
Days
6 inches
Plant 2 Height on Day 7?

25. What would be the plant height of plant 1 on day 14
What is Predicting?
Based upon YOUR graph
What would be the plant height of plant 1 on day 14

26. (X vs Y): Days of Growth Vs. Plant Height
Y-axis 16 14
Plant #1 12 10
Plant #2
Plant Height
in inches 8 6 4 2 `
Days
=10 inches
Plant #1 Height on Day 14?

27. What is Predicting? Based upon YOUR graph
What would be the plant height of plant #1 on day 23?
How did you figure that out?

28. (X vs Y): Days of Growth Vs. Plant Height
Y-axis 16 14
Plant #1 12 10
Plant #2
Plant Height
in inches 8 6 4 2 `
Days
=16 inches
Plant #1 Height on Day 23?

29. What is Predicting? Interpolate
To estimate a value between two known values.

30. (X vs Y): Days of Growth Vs. Plant Height
Y-axis 16 14
Plant #1 12 10
Plant #2
Plant Height
in inches 8 6 4 2 `
Days
EXAMPLE of INTERPOLATION

31. What is Predicting? Extrapolate
Mathematics. An estimated value which follows logically from the known values”

32. (X vs Y): Days of Growth Vs. Plant Height
Y-axis 16 14
Plant #1 12 10
Plant #2
Plant Height
in inches 8 6 4 2 `
Days
Example of EXTRAPOLATION