CPM Homework Help : MC1 Problem 9-78

On your own graph paper, draw axes, decide on a scale, and plot points to represent the data in the table below. Does this data appear to be proportional? Explain why or why not.

Quantity x	Quantity y
$2$	$7$
$6$	$21$
$9$	$31.5$
$5$	$17.5$
$1$	$3.5$

Hint:

Remember that proportional means that there is a multiplier you can use to find one quantity when you are given the other.
What do you multiply by $x$ to get $y$ ? Finding the multiplier should be easier with the smaller numbers.
$1\left(?\right) = 3.5$
$2\left(?\right) = 7$
In both cases you multiply by $3.5$ , this is true for every $x$ and $y$ pair.

Explore the problem using the eTool below.
Click the link at right for the full version of the eTool: 9-78 HW eTool