Posted by **lyndse** on Saturday, December 12, 2009 at 1:37pm.

For which values is the relationship linear? Tell how you decided. Write the equation for each linear relationship

x 5 10 15 20 25 30

y 20 30 40 50 50 50

- Math -
**drwls**, Saturday, December 12, 2009 at 2:07pm
It is linear from x = 5 to x = 20 because the ratio of the change in y to the change in x is a constant over that interval. There is a different linear relationship (y = constant)for 20<x<30.

The slope is discontinuous at x=20. Two linear lines join there (if you were to plot a graph).

- Math -
**lyndse**, Saturday, December 12, 2009 at 3:01pm
I still can't quite grasp it but your explanation is very helpful. Thank you!

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