Answer:
Y=-23
Step-by-step explanation:
Move constant to the right side and change the sign
y=-20-3
calculate difference
a number or quantity that when multiplied with another produces a given number or expression.
The perimeter of the rectangle is the sum of its dimensions
The dimensions that minimize the perimeter are 
The area is given as:

Let the dimension be x and y.
So, we have:

Make x the subject

The perimeter is calculated as:

Substitute 

Expand

Differentiate

Set to 0

Rewrite as:

Divide both sides by -1

Multiply y^2

Divide by 2

Take square roots of both sides


Substitute
in 



Hence, the dimensions that minimize the perimeter are 
Read more about perimeters at:
brainly.com/question/6465134