A line passes through $(2,2,1)$ and $(5,1,-2).$  A point on this line has an $x$-coordinate of 4.  Find the $z$-coordinate of the point.
Question:
A line passes through $(2,2,1)$ and $(5,1,-2).$  A point on this line has an $x$-coordinate of 4.  Find the $z$-coordinate of the point.
Answer:
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A line passes through $(2,2,1)$ and $(5,1,-2).$  A point on this line has an $x$-coordinate of 4.  Find the $z$-coordinate of the point.
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