l=2w+14 perimeter=88 what is length and width

I assume you are talking about a rectangle.

P = 2l + 2w

Substitute 2w+14 for l and 88 for P

88 = 2(2w+14) + 2w

88 = 4w+28+2w

88 = 6w+28

60 = 6w

w = 10

Plug w=10 into 2w+14.

l = 2*10+14 = 34