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