Proportional Relationships Semester Exam

Front

What does k represent in the equation y = kx?

Back

k represents the constant of proportionality.

Front

Is y = 2x - 4 a direct variation equation?

Back

No, it is not a direct variation equation.

Front

What is the correct constant of proportionality if your friend incorrectly says it is 1/18?

Back

The correct constant of proportionality is found by using the formula k = y/x.

Front

If Melanie buys 2 seashells for $0.80, what is the cost per seashell?

Back

The cost per seashell is $0.40.

Front

Which formula is used to find the constant of proportionality?

Back

k = y/x.

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

How do you determine if a relationship is proportional from a graph?

Back

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

Front

What is the formula for direct variation?

Back

The formula for direct variation is y = kx.

Front

If y = 3x, what is the constant of proportionality?

Back

The constant of proportionality is 3.

Front

What does it mean if two quantities are directly proportional?

Back

It means that as one quantity increases, the other quantity increases at a constant rate.