Check whether the slope between point #1 and point #2 is the same as the slope between point #2 and point #3. If it is, then they are collinear.
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The GCF is 5.
No. Not "No, I won't explain how" but "No, 10 isn't a factor of 15 or 25."
None of those pairs has a GCF of 15.
Three pairs of numbers with a GCF of 5 are: 5 and 10, 10 and 15, and 5 and 15.