Gregg K. answered • 10/10/18

#mathtutor AP Calculus & AP Statistics Teacher / College Teacher

draw a rectangle and label width x and height y

xy = A is what we are maximizing

However, we only have 600 = 2x + 3y since we have a fence in the middle

solve 600 = 2x+3y for either x or y.

plug that equation into xy = A

Now we have a function A(y) or A(x)

Derive A(y) or A(x) and set the derivative equal to 0, then solve for x or y