Comparing Constant of Proportionality

Write an equation for this relationship.

• y=18x

• y=18.50x

• y=22.50x

• y=22x

Is this table proportional?

• Yes

• No

Write an equation for this situation.

• y=9.75x

• y=19x

• y=19.25x

• y=9.5x

In the equation y = 14x, what is the constant of proportionality?

• y

• x

• 14

• y=14

Review: Is this proportional?

• yes

• no

Does this graph represent this table?

• yes

• no

The graph shows the proportional relationship between the number of days Restaurant T is open and how many people they served.  The equation y=82x represents the relationship for Restaurant S.  Which restaurant served more people?

• Restaurant S

• Restaurant T

• They both served the same amount of people

In a proportional relationship, the constant ratio is called the

• constant of proportionality

• proportion

• unit rate

Which of the following is true about the constant of proportionality? Select all that apply.

• The constant of proportionality is also the unit rate.

• The constant of proportionality is always equal to 1.

• The constant of proportionality is always equal to 0.

• There is no constant of proportionality in a nonproportional relationship.

• If two quantities are proportional, the constant of proportionality is the constant ratio

  between them.

Identify the constant of proportionality.

• k = 2x

• k = 2

• k = 4

• none (not proportional)