### Home > CC1 > Chapter 7 > Lesson 7.3.1 > Problem7-88

7-88.
1. On graph paper, draw a rectangle with a width of 5 units and a length of 7 units. 7-88 HW eTool (Desmos). Homework Help ✎

1. Draw a new rectangle that is an enlarged copy of your original rectangle and has a length of 13 units.

2. Show how you can calculate the width of your new rectangle.

Notice that the side 7 units long corresponds to the side 13 units long.

What number did you multiply 7 units by to get 13 units?
Use this same multiplier to calculate the new enlarged width.

$\frac{13}{7}\approx\ 1.86$

Use 1.86 to find the new width of the rectangle.

5(1.86) = 9.3 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: CC1 7-88 HW eTool