IXL - Find the constant of proportionality from tables and graphs (Algebra 1 practice)

Dana is finding the perimeter of different-sized squares.

There is a proportional relationship between the side length of the square in inches,

and the perimeter of the square in inches,

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

inches in perimeter per inch in side length

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Learn with an example

question

Russell is participating in a fun run to raise money for the West Side Children's Hospital. The run is held at Russell's high school track. The more laps Russell runs around the track, the more money he raises for the hospital.

There is a proportional relationship between the number of laps Russell runs,

and the amount of money he raises for the hospital (in dollars),

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

dollars per lap

key idea

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

solution

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 dollars per lap.

Looking for more? Try these:

Lesson: Proportional relationships

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Work it out

Not feeling ready yet? These can help:

X.1Find the constant of proportionality from a table

X.4Find the constant of proportionality from a graph

Lesson: Proportional relationships

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