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lanjutan ada di foto, semoga membantu
m1 = -x / y = -2/3
2px + (p + 3)y = -p
m2 = - (2p / (p + 3))
syarat tegak lurus yaitu m1 . m2 = -1
-2/3 . m2 = -1
m2 = 3/2
-2p / (p + 3) = 3/2
kali silang
-4p = 3(p + 3)
-4p = 3p + 9
-7p = 9
p = -9/7