I need help with number 9

Square; x=2; y=1

Step-by-step explanation:

Being that the following quaderlateral has equal sides and angles equal to 90 degrees each, it would be classified as a square.

Now, knowing that they have all equal sides, you could say that

1). 5x-4=3x

as well as

2).2y+4=5y+1

Now, solve for each of the variables:

1). 5x-4=3x

    (Minus 3x from both sides and add 4 to both sides)

     2x=4

     (Divide by 2)

     x=2

2). 2y+4=5y+1

    (Minus 5y from both sides and minus 4 to both sides)

   -3y=-3

   (Divide by -3)

      y=1

Hope it helped! (: