The time (t) required to empty a tank varies inversely as the rate (r) of pumping. pump can empty a tank in 90 minutes at the rate of 1200 L/min. How long will the pump take to
empty the tank at 3000 L/min?
minutes
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the answer will be the last one

the answer is (-4,-4)

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step-by-step explanation:

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: