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pada garis
2x - 4y = 6
-4y = -2x + 6
y = 1/2·x - 3/2 ⇒ m₁ =1/2
berdasrkan pilihan,
A. 3x - 2y = 6 ⇒ m₂ = 3/2 (tidak sama)
B. 4x - 2y = 6 ⇒ m₂ = 2 (tidak sama)
C. x - 2y = 0 ⇒ m₂ = 1/2 (sama)
D. 2x - y = 0 ⇒ m₂ = 2 (tidak sama)
jadi jawabannya yg bener adalah C. x - 2y = 0