Is It a Proportion Graph

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

• 45
• 90
• 135
• 2

What is the constant of proportionality for this table?

• 1/9
• 9
• 8

Does this table represent a proportional or non-proportional relationship?  Why?

• It is proportional because y=5x + 1
• It is not proportional because it has a constant value in the equation. 

Is this a proportional equation?  Why?

• It is not proportional because it doesn't have a constant.
• It is not proportional because it doesn't have a constant rate of change.
• It is proportional because if x = 0, y = 0.
• It is proportional because it has a y intercept.

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 relationship proportional?

• No, because she starts jogging at nine miles.
• Yes, because if she jogs zero minutes, she would not  have gone any distance.

Write an equation to represent the graph.  Is it proportional or non-proportional.

• y = 5x - 3.  It is proportional
• y - 3 = 5x.  It is proportional
• y = -5x - 3.  It is not proportional
• y = 5x - 3.  It is not proportional.

Is the following equation a proportional relationship?
y = -3x+4

• Yes, because there is a +4
• No, because there is a +4

Is the graph proportional or non-proportional?

• Proportional
• Non-Proportional

Stella got a new internet plan.  The company charges her $0.15 for each minute plus a monthly fee of $40.  What equation would be used to calculate how much the cost is for her new internet plan?

• y=0.15x-40
• y=0.15x+40
• y=0.15-40x
• y=0.15+40x