I can't see a square or a D given with your question.
But to find the perimeter you just have to add the surface of every side of the square.
Answer:
x = 6
y = 2
Step-by-step explanation:
We write to expressions since there are two unknown here which is x and y. The first expression is the <span>sum of two numbers, x and y, is 12.
x + y = 12
The second expression is that the </span><span>difference of x and two times y is 6.
x -2y = 6
Therefore, the values of x and y are 10 and 2.</span>
