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1/2=-p/2p-1
-2p=2p-1
-4p=-1, p=1/4
m1 = -4/2
garis2 : px+(2p-1)y = 9
m2 = -p/(2p-1)
tegak lurus berarti m1.m2 = -1
(-2).(-p/(2p-1)) = -1
2p = -(2p-1)
2p = -2p +1
4p = 1
p = 1/4