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maka, m₁ = -1/2
m₁ . m₂ = -1
-1/2 . m₂ = -1
m₂ = -1 per -1/2
m₂ = 2
Jadi, gradien yang tegak lurus dengan garis G adalah 2.
m₁ = - 1/2
syarat tegak lurus:
m₁ x m₂ = - 1
m₂ = - 1/m₁
= - 1/(- 1/2)
= 2