1. Linking data to straight-line graphs
Linear relations
Linking data to straight-line graphs

2. values and graphs
When we have a table of values, we can create a graph to represent the data
Remember our baskets of kiwis?
Here is the table of values we had:
basket # (b)
Kiwis (k) 1 5 2 10 3 15 4 20

3. Graphing the relation Our equation was k = 5b
Finally, we graph the equation:
Voila: it’s a straight line!
Notice how the kiwis are on the y axis – it’s the dependent variable!

4. Values and graphs Remember the arc design of beads?
Here’s the table of values we created:
row number (n)
number of beads (b) 1 7 2 12 3 17 4 22

5. Graphing the relation Finally, we graph the equation
Our equation was b = 5n + 2
Finally, we graph the equation
Notice how the beads are on the y axis – it’s the dependent variable!

6. Values and graphs
Remember the super tanker that had to make an emergency stop?
Here is the table of values that we created:
time (min)
Speed (km/h) 30 3 24 6 18 9 12 15

7. Graphing the relation The equation we created was -2t + 30
Here is the graph that represents the equation:
Notice how the speed is on the y axis – it’s the dependent variable!

8. Homework:
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