Identifying Constant of Proportionality

Find the constant of proportionality from a graph

This is an example of a graph with a line that is proportional. The constant of proportionality is 5. You can find the constant of proportionality by dividing one of the time values by the water values.

This is another example of a proportional relationship on a graph. The line goes through the origin (0, 0) and is a straight line. The constant of proportionality would be 50. In the context of the problem it takes 1 hour to get a total cost of $50.

This is an example of a non proportional relationship. In this situation, the line is a straight line, however the line does not cross the origin (0, 0).

Multiple Select

Which graphs below represent proportional relationships?

Open Ended

What is the constant of proportionality for the graph shown?

Open Ended

What is the constant of proportionality in the graph?

You can determine if a graph represents a proportional relationship by determining if their is a constant of proportionality.

You find the constant of proportionality by dividing the ordered pairs (all of the ordered pairs respectfully)

Complete the assignments on finding the constant of proportionality in graphs...