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y = -2x + 4
m₁ = -2
Karena tegak lurus, maka gradiennya berbeda :
m₂ = -1 : m₁
= -1 : -2
= 1/2
y = mx - ( mx₁ - y₁ )
y = 1/2x
2y = x
x - 2y = 0
y = -2x+4
gradien garis 2x+y-4 = 0 adalah -2
-2 X
titik (0,0) dengan gradien
2y-0 = x-0
2y = x-0+0
2y = x
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