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maka: Garis px+(2p-1)y=9
⇒px+(2p-1)y=9
⇒(2p-1)y=-px+9
⇒y=
⇒m₁=
Garis 6x+3y=9
⇒3y=-6x+9
⇒y=-2x+9
⇒m₂=-2
Garis 6x+3y=9 ⊥ px+(2p-1)y=9
⇒Rumus= m₁ × m₂ = -1
⇒ × -2 = -1
⇒
⇒2p=-1(2p-1)
⇒2p=-2p+1
⇒4p=1
⇒p=