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The velocity components in the $x$ and $y$ directions for an incompressible flow are given as $u = (-5 + 6x)$ and $v = -(9+6y)$, respectively. The equation of the streamline is

- $(-5+6x)-(9+6y) = \text{constant}$
- $\dfrac{-5+6x}{9+6y}= \text{constant}$
- $(-5+6x)(9+6y) = \text{constant}$
- $\dfrac{9+6y}{-5+6x}= \text{constant}$