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tw101

  • one year ago

How do I prove that when two points are connected create a positive or negative slope? I have to prove points: (2,5)(12,19) make a positive line. And then points (21,5)(12,19) create a negative line. But im not sure how to prove it.

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  1. Mertsj
    • one year ago
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    Do you know the slope formula?

  2. tw101
    • one year ago
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    is it the m= y2-y1/x2-x1?

  3. Mertsj
    • one year ago
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    yes. Just use that on each pair of points to show that one slope is positive and the other negative.

  4. tw101
    • one year ago
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    okay one second

  5. tw101
    • one year ago
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    okay, for the positive slope points I got 7/5 when I plugged the points into the formula

  6. Mertsj
    • one year ago
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    Me too. Go for the next one.

  7. tw101
    • one year ago
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    okay i got 14/-9

  8. Mertsj
    • one year ago
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    me too.Good job.

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spraguer (Moderator)
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