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\textbf{Math 225: Calculus III}
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\textbf{Quiz 2}\quad \textsl{September 12, 2002}
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\bigskip
Consider the plane $M_1$ defined by $2y+z = -1$ and the plane $M_2$
defined by $2x-z = 3$.

\bigskip

1. Find the angle between $M_1$ and $M_2$. You may give your answer in
terms of an inverse trig function.

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2. Find the parametric equations of the line of intersection of $M_1$
and~$M_2$.


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