The cost to purchase a movie from Movie Time is $3.00 per movie as well as a $10.00
membership fee. To purchase a movie from
Movie City, the membership fee is $30.00 and
every downloaded movie is $2.00. How many
downloaded movies must be purchased for
the monthly price to be the same?

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: