Interpreting Proportional Graph

A proportional relationship must have a constant rate of change.

• True
• False

A graph displaying a proportional relationship MUST

• be a straight line
• pass through the origin
• be a straight line AND pass through the origin

Is the graph proportional or non proportional?

• proportional
• non proportional

Is the graph proportional or non proportional?

• proportional
• non proportional

What does the point (40, 80) on this graph represent?

• The cost of inviting 80 guests is $40.  
• The cost of inviting 40 guests is $80.
• The cost of inviting 4 guests is $8.
• The cost of inviting 1 guest is $2.

Is this table proportional?

• Yes
• No

Which equation correctly represents this proportional relationship?

• y = 1/3
• y = 1/3x
• y = 3
• y = 3x

What is the constant of proportionality?

• 8
• 16
• 24
• 2

3 pounds of apples cost $3.60 and 7 pound of apples cost $8.40. Which equation correctly represents this proportional relationship?

• y = .83x
• y = 3.6x
• y = 1.2x
• y = 1.1x

Is this table proportional?

• Yes.  It shows a constant rate of change.
• No.  It does not show a constant rate of change.