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math-utils
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slope
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(slope P1|X1 P2|Y1 [X2 Y2]) -> number
procedure
Slope of a line defined by 2 points,
P1
&
P2
or
X1 Y1
&
X2 Y2
.
P1
&
P2
(pair number number)
X1 Y1
&
X2 Y2
number number