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y = mx - ( mx₁ - y₁ )
y = 3/2x - ( -6 - 3 )
y = 3/2x + 9
y = 3/2x + 18/2
2y = 3x + 18
2y - 3x - 18 = 0
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b).
y = -2x + 6
m₁ = -2
Karena tegak lurus, maka gradiennya berbeda :
m₂ = -1 : m₁
= -1 : -2
= 1/2
y = mx - ( mx₁ - y₁ )
y = 1/2x - ( -2 - 3 )
y = 1/2x + 5
y = 1/2x + 10/2
2y = x + 10
2y - x - 10 = 0