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⊥ m2 ⇒ m1 . m2 = -1
m2 = -1/3
-1/3 = (p+1-10)/(p-1) ⇒kali silang
-p+1 = 3p-27
27+1 = 3p+p
4p = 28
p = 7
jadi titik B terletak di (7,8)