Question

1. The perimeter of a rectangle is

P = 2w + 21, where w is the width of the
rectangle and t is the length of the rectangle.
Rearrange this formula to find the width of the
rectangle.

Answer 1

We are asked to find the width of the rectangle. In the equation “w” is the width of the rectangle, so all we have to do is isolate it .

p=2w+21

1) subtract 21

p-21=2w

2)divide by 2

p-21/2=w

Therefore, the width of the rectangle, in the form of an equation is w=p-21/2

Answer 2

w = ( p-2

l

) / 2

Explanation:

Switch sides:

2w + 2l = p

Move 2l to the right side:

2w = p - 2l

Divide both sides by 2:

w = ( p-2

l

) / 2