find the points of (r) that distam 3 units from point A (0,2,1) (r): y=-x+2 z=2x-2 Answer: (2,0,2) and (0,2,-2)
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etc. etc. Solve for x (you'll get two values as you end up solving a quadratic) and plug this into your expressions of y and z.
is obvious. thanks
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