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=> 8 - 10 / 2 - k
=> -2/(2-k)
y2 - y1 / x2 - x1
=> 7 - 8 / 4 - 2
=> -1/2
-2/(2-k) = -1/2
=> -4 = -2 + k
=> k = -4 + 2
=> k = -2