IXL | Find the constant of proportionality from a graph

Isaac wants to save up some money to buy a new smartphone, so he babysits on the weekends.

There is a proportional relationship between the time Isaac spends babysitting (in hours),

and the amount of money he earns babysitting (in dollars),

What is the constant of proportionality? Write your answer as a whole number or decimal.

dollars per hour

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Learn with an example

Tori is throwing a pool party to kick off the summer. Her pool is empty, so she starts filling it with water from a garden hose.

There is a proportional relationship between the time Tori has been filling up the pool (in minutes),

and the volume of water in the pool (in gallons),

What is the constant of proportionality? Write your answer as a whole number or decimal.

gallons per minute

The graph of a proportional relationship is a straight line passing through the origin

(

)

If x and y have a proportional relationship, the constant of proportionality is the ratio of y to

To find the constant of proportionality, first identify the coordinates of one of the points on the line.

Calculate the ratio of the

y-coordinate

to the

x-coordinate.

The constant of proportionality is 10 gallons per minute.

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