Ratios Proportions Constant of Proportionality

Which graph is proportional?

• A

• B

• C and D

• All of the graphs are proportional

Craig earns extra money as a lifeguard. He earns $37 for 4 hours and $64.75 for 7 hours.  What is the constant of proportionality (how much did he make per hour)?

• $37

• $64.75

• $9.25

• $18.50

Determine whether each pair of ratios forms a proportion

• Proportion

• Not a Proportion

Determine whether each pair of ratios forms a proportion

• Proportion

• Not a Proportion

Solve for x 

• x = 16

• x = 28

• x = 1/26

• x = 26

Find the unit rate of 624 calories in 3 servings.

• 1,872 calories per serving

• 208 calories per serving

• 624 calories per serving

• 621 calories per serving

Write an equation for this situation.

• y=9.75x

• y=19x

• y=19.25x

• y=9.5x

What makes a graph proportional?

• Linear

• The line is only in quadrant 1

• Curvy line

• Linear and the line goes through the origin

Does the table represent a proportional relationship?

• Yes.

• No.

Does the equation x/y = 3 form a proportional relationship?

• Yes, because k = 3

• Yes, because k = 1/3

• No, because it does not form a line.

• No, because k is more than one value.