Question 254503
Suppose that a rectangle has an area of 45 square meters.
 Express the perimeter P as a function of the length x of one of the sides.
:
Let x = length
Let y = width
:
The area equation:
x*y = 45 sq/m
y = {{{45/x}}}m
:
P = 2x + 2y
Substitute {{{45/x}}} for y
:
P(x) = 2x + 2({{{45/x}}})