Things to Learn

  • Use the constant of proportionality to represent proportional relationships by equations in real-world contexts as they relate the equations to a corresponding ratio table or graphical representation.

Jackson’s Birdhouses

A Corny Problem

Lesson Summary

How do you find the constant of proportionality? Divide to find the unit rate, y/x=k.

How do you write an equation for a proportional relationship? y = kx, substituting the value of the constant of proportionality in place of k.

What is the structure of proportional relationship equations, and how do we use them? x and y values are always left as variables, and when one of them is known, they are substituted into y = kx to find the unknown using algebra.

Exercises and Practice

Before You Go