Posted by **Derek** on Thursday, July 3, 2008 at 6:14pm.

Any ideas on how to solve this: Use a vector solution to show that a scalar equation for the line through the points P1(x1, y1) and P2(x2, y2) is y-y1/x-x1 = y2-y1/x2-x1? Very confused as to what is meant by this question. Thanks.

- Calculus:Help! -
**drwls**, Thursday, July 3, 2008 at 6:18pm
This just says, correctly, thst the change in y from point (x1,y1) is equal to the slope times the change in x from that point.

The slope of the line is (y2-y1)/(x2-x1)

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