Real-World: Direct Proportion

Front

What is direct proportion?

Back

Direct proportion is a relationship between two quantities where if one quantity increases, the other quantity increases at the same rate. For example, if you double the number of items, the cost also doubles.

Front

If 5 oranges cost $2, how much do 2 dozen oranges cost?

Back

$9.60

Front

How many months are in 6 years?

Back

72 months

Front

What is the formula for direct proportion?

Back

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

Front

If it costs $180 to rent a car for 3 days, how much does it cost to rent it for 1 week?

Back

$420

Front

What is the relationship between feet and inches?

Back

1 foot = 12 inches.

Front

If 1 foot = 12 inches, how many inches are in 5 feet?

Back

60 inches.

Front

What does it mean if two quantities are directly proportional?

Back

It means that the ratio of the two quantities remains constant.

Front

Write an equation that relates the cost of plastic cups (C) to the number of cups (n) if 6 cups cost $2.34.

Back

C = 0.39n.

Front

If 10 apples cost $5, how much do 25 apples cost?

Back

$12.50.