CPM Homework Help : ACC6 Problem 7-88

On graph paper, draw a rectangle with a width of $5$ units and a length of $7$ units.

Draw a new rectangle that is an enlarged copy of your original rectangle and has a length of $13$ units.
Hint (a):
Notice that the side $7$ units long corresponds to the side $13$ units long.
Show how you can calculate the width of your new rectangle.

Step 1 (b):
What number did you multiply $7$ units by to get $13$ units?
Use this same multiplier to calculate the new enlarged width.
$\frac{13}{7}\approx\ 1.86$

Step 2 (b):

Use $1.86$ to find the new width of the rectangle.

$5(1.86) = 9.3 \text{ units}$

Use the eTool below to help you better understand how scale factors work.
Click the link at right for the full version of the eTool: