Respuesta :

harpazo
Let x = width

Let length = 3x - 3

Let perimeter = 42

42 = 2x + 2(3x - 3)

42 = 2x + 6x - 6

42 = 8x - 6

42 + 6 = 8x

48 = 8x

48/8 = x

6 = x

The width is 6 meters.