Question

your aunt is building a garden in her backyard she has 90ft of fencing to surround it. if she wants the lenaght to be 15 ft long than the width what will the deimensions of the garden be?

Answer 1

The perimeter is x+x+x+15+x+15 or 4x+30 and this has to equal the 90.
4x+30=90
4x=60
x=15ft
the dimensions are 15ftx30ft

Answer 2

perimeter = 90 = 2x + 2(x-15)
4x = 120
x = 30
lenthg = 30 and width = 15