(2, 5) (4, 1)
slope = (1 - 5) / (4 - 2)
slope = -4/2
slope = -2
y - 5 = -2(x - 2)
y - 5 = -2x + 4
y = -2x + 4 + 5
y = -2x + 9 We would have gotten the same equation
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