How do I know which is right-
y2-y1 over x2-x1 or
y1-y2 over x1-x2
People say it's the same on yahoo answers but they get different answers a lot. HELP
It's different.
Let's say (-2,8) and (2,-1).
First way: -1 - 8 = -9
2 - (-2) = 0
So... -9/0
Second way: 8- (-1) = 9
-2 - 2 = 0
So... 9/0
See it's like this all the time. In this example they are the same because it is undefined, but in other examples they are regular numbers that are negatives.

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Its the same, but in different order.

either one works... so long as your going the same way.
point 1 to point 2 or point 2 to point 1

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