Mathematics

Problem

At an instant,

\displaystyle \frac{dy}{dt}=-4\,\text{units/s}

while

\displaystyle \frac{dx}{dt}=2\,\text{units/s}

. What is

\displaystyle \frac{dy}{dx}

at that moment? a)

-8

(decreasing) b)

2

(increasing) c)

-2

(decreasing) d)

-0.5

(decreasing)