Respuesta :

Answer:

8x+12

Step-by-step explanation:

Remember that perimeter is all the sides combined. A rectangle has the same length and width for both sides.  

P=2l+2w

P=2(4x-6)+2(12)

P=8x-12+24

P=8x+12
36 = 2(12) + 2(4x-6)
36 = 24 + 8x - 12
(take away 24 and add 12 to both sides)
24 = 8x
(divide both sides by 8)
3 = x