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3y = -4x + 24
y = -4/3x + 8
m₁ = -4/3
Karena tegak lurus, maka gradiennya berbeda :
m₂ = -1 : m₁
= -1 : -4/3
= 3/4
y = mx - ( mx₁ - y₁ )
y = 3/4x - ( 0 - 0 )
y = 3/4x
4y = 3x
3x - 4y = 0