Constant of Proportionality

In the equation y = 9x, what is the constant of proportionality?

• y
• x
• 9
• not enough information

REVIEW QUESTION
Which best describes the information represented in this table?
Beats      30      40       80
Minutes    1        2         3

•  proportional
• non-proportional

What is the formula for a proportional relationship?

• y=kx
• y=k/x
• z=ykx
• y=ky

How can you find the constant of proportionality?

• k = y/x
• k = x/y
• E=mc²
• y = kx

Time     1 day   2 days   3days
$ earned  $15    $30         $45
What is the constant (k) ?

• 15
• 60
• 90
• 30

What equation represents the relationship?

• y = 2x
• k = 2x
• 2 burgers per person
  x = 2y
• k = 2

The Origin runs through which ordered pair or coordinate points?

• (-1, 0)
• (1, 1)
• (0, 0)
• (0, 1)

Is the graph proportional or non proportional?

• proportional
• non proportional

Is this graph proportional?

• Yes
• No

A proportional relationship is represented by the equation y = 4x. Use the equation to fill in the table.  
        x   2     4     6      8
        y   ?     ?     ?     ?          

• 6, 8, 10, 12
• 8, 16, 24, 32
• 2, 1, 1.3, 1.5
• .5, 1, 1.5, 2