(4, 1), (5, -1).
m = (-1 - 1) / (5 - 4) = -2 / 1 = -2.
Y = mX + b.
Y = -2*4 + b = 1,
-8 + b = 1,
b = 1+ 8 = 9.
Eq: Y = -2X + 9.
Write an equation in slope intercept form of the line that passes through (4, 1) and (5, -1).
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