You are mailing a 21-pound item by parcel post. The total weight of an item and its packaging cannot be greater than 50 pounds. Write and solve an inequality that represents the heaviest the packaging can be without exceeding the 50-pound weight limit.

answer: d. $20

step-by-step explanation:

just took the test

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:

answer: y=0 if that is what u r looking for