Is It a Proportional Relationship?

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.

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

• Yes, because there is a +4

• No, because there is a +4

After 4 minutes a submarine has dove 600 feet below sea level. After 10 minutes it has reached a depth of 1,500 feet and after 25 minutes it is 3,750 feet below sea level. What is the constant of proportionality at which the submarine dives? 

• 300

• 150

• 3750

• 600

Why does this graph show a non-proportional relationship?

• It doesn't, it is proportional because it is a straight line

• It goes through the origin

• It does not go through the origin

• It is a straight line

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

• The graph is proportional because the y to x ratio is constant (the same).

• The graph is non-proportional because it does not pass through the origin (0,0).

• The graph is proportional because it is linear (a straight line).

• The graph is non-proportional because it is linear (a straight line).

Is the following equation a proportional relationship?
y=2x-1

• Yes

• No

What is the y-intercept for the following table and is it proportional or non-proportional?

• Proportional, y-intercept is 0

• Non-proportional, y-intercept is 0

• Proportional, slope is 0

• Non-proportional, slope is 0

Proportional or Non-Proportional:
The video game rental fee is $15 plus $3 per day. 

• Proportional

• Non-Proportional

Which graph is proportional?

• A

• B

• C and D

• All of the graphs are 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.