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=
=
B.
=
= -1
x2 - x1
a. m = y2 - y1 = - 3 - (- 4) = 1 = 1
x2 - x1 - 2 - 1 -3 3
b.m = y2 - y1 = -4 - (-5) = 1 = -1
x2 - x1 1 - 2 -1