Question

A rectangle has a perimeter of 8x+6 and a length of 3x. what is the width

Answer 1

l (length)=3x

P (perimeter)= 8x+6 = 2 x length + 2 x width

                        8x+6 = 2 (3x) + 2 x width

                        8x+6 = 6x + 2 x width

                         2 x width = 8x+6 - 6x

                         2 x width = 2x+6

                         width = 1/2(2x+6) = x + 3

Hope it helps