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<title>
9.1 - Reading questions
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<h2>[9.1] - Reading questions
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<ol class="todo incremental">
<li>Explain why the equation $y = x$ is the equation of a plane, not a line, in three-dimensional space.
<li>What is the distance betwen the points $(-1,-1,-1)$ and $(-4,-1,3)$?  (Show your work).
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