Direct-Inverse Proportion

In a direct variation, y=39 when x=3.  Find the value of y when x=2.

• 26
• 3
• 58.5
• 2

Is this a direct variation?
y=2x

• yes
• no

Write an equation for this relationship.

• y=4x
• y=1/8x
• y=1/4x
• y=8x

Which of the given graphs is a direct variation?

• A
• B
• C
• D

Write an equation for this situation.

• y=9.75x
• y=19x
• y=19.25x
• y=9.5x

Is this proportional?

• yes
• no

Write the equation for the table given.

• y = 1/3x
• y = 3x
• y = 1/2x

Is this proportional?
y = 7x + 3

• yes
• no

• direct variation
• inverse variation
• neither direct nor inverse variation

Portions of cake and number of people in the party

• Inverse variation

• Direct variation

• None