Proportional Relationships

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 quantity is constant.

Front

How can you identify if a relationship is proportional from a table?

Back

If the ratios of corresponding values (y/x) are the same for all pairs, the relationship is proportional.

Front

What is the unit rate?

Back

The unit rate is the ratio of two measurements in which the second quantity is one unit.

Front

How do you calculate the unit rate from a given rate?

Back

To find the unit rate, divide the first quantity by the second quantity.

Front

What does the equation y = kx represent?

Back

This equation represents a proportional relationship where k is the constant of proportionality.

Front

What is the constant of proportionality?

Back

The constant of proportionality is the constant value (k) that relates two proportional quantities.

Front

If Evan bought 5 pounds of bananas for $10, what is the cost per pound?

Back

The cost per pound is $2.

Front

If Christy bought 6 pounds of bananas for $9, what is the cost per pound?

Back

The cost per pound is $1.50.

Front

Who got the better deal: Evan or Christy?

Back

Christy got the better deal because she paid less per pound.

Front

What does a graph of a proportional relationship look like?

Back

A graph of a proportional relationship is a straight line that passes through the origin.