Book Maths Puzzle Area and Volume

the sides of his rectangled yard is 12'x9'. the pool is trisected in the rectangle. what is the perimeter of the pool?

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Book Other Question

im having trouble solving this problem for my homework. the book says=
' Use linear combinations to solve the system.'
x-y=4
x+y=12 I can't figure this proportion out

6/19n= -2/n*n=2

The n*n is actually n squared