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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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.

Mathematics
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Do you know the slope formula?
is it the m= y2-y1/x2-x1?
yes. Just use that on each pair of points to show that one slope is positive and the other negative.

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okay one second
okay, for the positive slope points I got 7/5 when I plugged the points into the formula
Me too. Go for the next one.
okay i got 14/-9
me too.Good job.

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