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Y = -2/3 x + 2 memiliki gradien m₁= -2/3 supaya tegak lurus maka
m₁ . m₂ = -1
-2/3 . m₂ = -1
m₂ = 3/2
Gunakan rumus : persamaan garis diketahui gradien m dan melewati
titik (X₁ , y₁), maka :
Y - y₁ = m₂(x-x₁)
Y - 2 = 3/2 (x +3)
Y = 3/2 x + 9/2 + 2
Y = 3/2 x + 13/2