Proportional Relationships in Real Life

Front

What is a proportional relationship?

Back

A proportional relationship is a relationship between two quantities where the ratio of one quantity to the other is constant.

Front

Is Vu's age compared to his sister's age a proportional relationship?

Back

No, Vu is four years older than his sister, which means the ratio changes as they age.

Front

If Lisa saves $20 every week, is the relationship between weeks and total savings proportional?

Back

Yes, because the total savings increases by a constant amount for each week.

Front

What does it mean if a relationship is not proportional?

Back

It means that the ratio between the two quantities is not constant.

Front

Is the cost of cookies from a bakery proportional if they sell boxes of 12 for $15 and individually for $1.50?

Back

No, because the cost per cookie differs when bought in bulk versus individually.

Front

What is an example of a proportional relationship in running?

Back

If Janna runs at a steady pace of 7 minutes per mile, the relationship between time and distance is proportional.

Front

Why is the amount of flour used in baking cookies proportional?

Back

Because the ratio of flour to batches remains constant at 2 cups per batch.

Front

What is the formula for finding a proportional relationship?

Back

The formula is y = kx, where k is the constant of proportionality.

Front

How can you tell if two quantities are proportional?

Back

If you can express their relationship as a constant ratio, they are proportional.

Front

What is the constant of proportionality?

Back

It is the constant value (k) that relates two proportional quantities.