Unit 7 Review Ratios and Proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you determine if two ratios are equivalent?

Back

Two ratios are equivalent if they simplify to the same fraction or if their cross products are equal.

Front

What does it mean for a relationship to be proportional?

Back

A relationship is proportional if it can be represented by a straight line that passes through the origin on a graph.

Front

What is the formula for finding a proportional relationship?

Back

The formula is y = kx, 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 the two variables in a proportional relationship.

Front

How can you tell if a graph represents a proportional relationship?

Back

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

Front

What is an example of a non-proportional relationship?

Back

An example of a non-proportional relationship is a graph that is a straight line but does not pass through the origin.

Front

If Melanie buys 2 seashells for $0.80, what is the unit rate?

Back

The unit rate is $0.40 per seashell.

Front

If Rosi buys 5 seashells for $2.00, what is the unit rate?

Back

The unit rate is $0.40 per seashell.