Question

you are building a rectangular dog pen with an area of 90 ft^2. you want the length of the pen to be 3 ft longer than twice its width. which equation can you use to find the width of the pen?

Answer 1

Area = length * width = 90

but you want "length of the pen to be 3 ft longer than twice its width" so you need to write the length in terms of the width... so,

length = 2*width + 3

so area is now:

length * width = 90
(2*width + 3) * width = 90
(2w + 3)w = 90

can you solve this equation from here?