Proportional Relationships and Direct Variation

Is there a direct variation between the meters swam and seconds it took Mikey to swim those distances?

What makes a graph proportional? SELECT ALL THE APPLY

• Has to be a straight line.

• As long as there is some kind of line, it is proportional.

• Has to cross through the origin (0, 0).

• Has to start from the negative side and move up to the positive side.

Is the relationship of this graph proportional or non-proportional?

What is the constant of proportionality?

y = 14x

What is the constant of proportionality?

9y = 72x

What is the unit rate if there are 1,760 Calories in 8 servings?

Is the given table a direct variation? If so, what is the constant of variation?

• Yes; 1/3

• Yes; 3

• Yes; 5

• No

Which of the given graphs is a direct variation?

• A

• B

• C

• D

• direct variation
• inverse variation
• joint variation
• none of these

• direct variation
• inverse variation
• joint variation
• none of these