Constant of proportionality

In the equation y = 14x, what is the constant of proportionality?

• y
• x
• 14

What is the constant of proportionality for this table?

• 1/9
• 9
• 8

Write an equation for this relationship.

• y=18x
• y=18.50x
• y=22.50x
• y=22x

In order for a graph to represent a direct variation the line must be straight and go through the _________.

• y-axis
• origin
• x-axis
• 1st quadrant

Which graph is proportional?

• A
• B
• None of the graphs
• All of the graphs are proportional

The constant of proportionality in the equation y = ½x is _______. 

• x
• y
• 1/2
• 2

Is the given table a proportional relationship? If so, what is the constant?

• Yes; 1/3
• Yes; 3
• Yes; 5
• No

What makes a graph proportional?

• Straight line
• The line goes through the origin
• Curvy line
• Straight line and the line goes through the origin

What is the constant of proportionality for the following graph?

• 80
• 20
• 40
• 160

Identify the constant of proportionality.

• k = 2x

• k = 2

• k = 4

• none (not proportional)