Proportional relationship or not? (7th grade math/prealgebra)

We look at the three main features of proportional relationships:

• The values of the two variables form rates (or ratios) and those rates are equivalent.
• The graph is a line through the origin.
• The equation is of the form y = mx (m being the constant of proportionality).

Then we see two tables of values and we check whether those depict a proportional relationship. Lastly we look at a situation where in one hour, one worker can wash 6 windows. If the one hour stays constant, we can vary the number of windows and workers and see a relationship there. But what if instead we keep the number of windows constant (24 windows), and observe the number of workers versus time?

See also

Solving Proportions: Cross-Multiplying — video lesson

Math Mammoth Grade 7 curriculum (pre-algebra)

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