IXL | Find the constant of proportionality from a graph

Helen and her friends set out to sea on their annual fishing trip.

There is a proportional relationship between the time (in hours) Helen and her friends spend sailing,

and their distance from shore (in miles),

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

miles per hour

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Learn with an example

Brian loves to bake blueberry muffins for his friends and family.

There is a proportional relationship between the volume of flour Brian uses (in cups),

and the number of muffins he bakes,

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

muffins per cup of flour

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 9 muffins per cup of flour.

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