Please help me understand the example in Chapter 8-7 example 4 . They have m = y 2 - y 1 over x 2- x 1 then they put m = 5-1 over -2 -2 or -1. So how did they get -1. Cause I got 3 over -4. What did I do wrong and can you explain this to me so that I can better under stand this?
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