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y1 - y2/x1 - x2
a. 2 + 2/-1 - 0
= 4/-1
= -4
b. 3 + 2/0 + 3
= 5/3
c. 3 + 1/1 - 3
= 4/-2
= -2
d. -4 + 4/-3 + 6
= 0/3