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

What does it mean if two quantities are in proportion?

Back

It means that as one quantity increases or decreases, the other quantity does so at a constant rate.

Front

If 5 gallons of gas cost $15, what is the cost per gallon?

Back

$3 per gallon.

Front

What is the formula for finding a unit rate?

Back

Unit Rate = Total Quantity / Number of Units.

Front

If you travel 240 miles using 8 gallons of gas, how many miles do you travel per gallon?

Back

30 miles per gallon.

Front

True/False: A graph of a proportional relationship is a straight line that passes through the origin.

Back

True.

Front

If 3 pounds of apples cost $6, how much do 5 pounds cost?

Back

$10.

Front

What is the constant of proportionality in the equation y = kx?

Back

The constant of proportionality (k) is the ratio of y to x.

Front

If a recipe calls for 2 cups of flour for every 3 cups of sugar, how much flour is needed for 9 cups of sugar?

Back

6 cups of flour.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.