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Quiz 5\quad Oct. 6/8, 1992\cr
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1. Compute the slope of the line tangent to the curve given by the intersection of the plane $y = 2$ and the surface $z = x^3 y - y^2 x$ at the point $(2,2,8)$.
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2.  Let $f(x,y) = y^x$,  ($x$, $y > 0$). Compute $f_{xy}$. (Hint: rewrite $f(x,y)$ using the exponential and logarithm functions).
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