Proportional/Nonproportional Equations

Which best describes the equation?
y = 75x

• Proportional
• Nonproportional

Which best describes this equation?
y= 3.75x + 2

• Proportional 
• Non-proportional

Does this graph represent a proportional relationship?  

• No, because it doesn't pass through the origin.
• Yes, because it doesn't pass through the origin.
• Yes, because it intersects the y axis.
• No, because it intersects the x axis.

Does this graph represent a proportional relationship?

• Yes, because the line is pretty.
• No, because the line goes through the origin.
• Yes because the line goes through the origin.
• No, because the graph is non-proportional.

Which graph is non-proportional?

• A
• B
• C
• D

The graph shows the water level as a bathtub fills.  Select the correct choice that describes this graph.

• The graph is linear and proportional.
• The graph is linear and non-proportional.

What is the y-intercept in the following equation:  y=-4x-5

• -4
• -4x
• 5
• -5

Which best describes the table?

• proportional
• non-proportional

What is the constant of proportionality (in miles per hour) based on the table?

• 45
• 90
• 135
• 2

Is this table proportional?

• Yes
• No