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October 22nd, 2007, 08:34 PM   #1
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proofs

>write a proof to show that in the equation y=mx+b, b is the y-intercept
(think about what is true about a y-intercept)

>prove that a vertical line has no slope.
(think about the coordinates of the points on a vertical line and division by 0)

>prove point-slope equation
(any point (X sub2, Y sub2) on the line described must satisfy the equation, and that any point satisfying the equation must be on the line described)
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October 22nd, 2007, 10:24 PM   #2
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Which part are you stuck on and why?
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