Write a direct variation equation that relates the two variables. Then solve. Suppose y varies directly as x, and y - 21 when x - 3. Find x when y - 42.

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

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:

care to share were the trapezoid shown is ?