Determine If a Graph Is Proportional

Is this graph proportional?

• Yes

• No

What are the two key factors to determine if the relationship is proportional?

• Graphs a straight line the begins at (0,0)

• Graphs a curvy line that begins at (0,0)

• Graphs a straight line that begins anywhere

• Graphs a curvy line that begins anywhere

Determine if this graph represents a proportional relationship. Is there a constant ratio? If so, state the constant of proportionality.

• 4

• 3

• 1/4

• Not a proportion

Is this the graph of a proportion? Explain how you know based on the features of the graph.

• Straight line through the origin - it is a proportion

• Not a proportion

Determine if this graph represents a proportional relationship. Is there a constant ratio? If so, state the constant of proportionality.

• 3

• 1/3

• 9/3

• Not a proportion

Write a y=kx equation that models the graph of a proportion passing through the point (10, 5).

• y=2x

• y=10x

• y=5x

• y=0.5x

Describe the two key features of the graph of a proportional relationship.

• Straight line

• Curved line

• Through the origin

• Not through the origin

In order for a graph to represent a proportional relationship, the line must be straight and go through the _________.

• y-axis

• origin

• x-axis

• 1st quadrant

Is this the graph of a proportion? Explain how you know based on the features of the graph.

• Straight line through the origin - it is a proportion

• Not a proportion

The number of trees and the number of apples are given in the table above.  Determine which statement below is correct.

• The table is not proportional because the unit rate is not constant.

• The table is proportional and the unit rate is 1/13

• The table is proportional and the unit rate is 13.

• The table is not proportional because it doesn't pass through the origin.