Rectangular Garden

The length and width of a rectangular
garden are 15 meters and 10 meters, respectively. A walkway of width x surrounds the garden.

(a) Draw a diagram that gives a visual representation of the problem.

(b) Write the equation for the perimeter y of the
walkway in terms of x.

For (a), see attachment. Is my picture correct?

For (b), see below.

y = perimeter

y = 2L + 2W

y = 2(x + x + 15) + 2(x + x + 10)

y = 2(2x + 15) + 2(2x + 10)

y = 4x + 30 + 4x + 20

y = 8x + 50

You say?

 

calculation is perfect, but a diagram is not
should be like this:

 

I forgot to represent the length as x.