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Are the points (1,1) (5,5) and (7,-4) collinear or coplanar? Explain.

User General
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They are co-planar. the slope between (1,1) and (5,5) is 4/4, or 1. On this line, there is (7,7), with a slope of 6/6, or 1, but not (7,-4) which has a different slope of 6/-5, or -6/5.
User Dave McLure
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