Answer:

Explanation:
Our perimeter will be 140 cm and our width of the rectangle will be 6w. We will then divide 14w and 140 by 14 so we can get w by itself. Then, we will divide the perimeter by the width.
Step 1: Let 6w will be our length and let the perimeter be 140 cm.

Step 2: Perimeter means that you add up all the 4 sides of the rectangle.


Step 3: Divide both sides 14 to get the single w variable.

Step 4: Simplify.

Step 5: Flip sides.

~I hope I helped you :)~