Apackage in the shape of a rectangular box can be mailed by the us postal service if the sum of its length and girth (the perimeter of a cross-section perpendicular to the length) is at most 108 in. find the dimensions of the package with largest volume that can be mailed. (for full credit, you must indicate how you know that these dimensions give the maximum volume.

is only a line? i think so

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation: