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y=-x+12 -> m= -1
tegak lurus= m1 × m2 = -1
-1 × m2 = -1
m2 = 1
jadi gradien garis h = 1
2y = -2x +24
y = -2/2x +24/2
y = -1x +12
maka, m₁ = -1
m₁ . m₂ = -1
-1 . m₂ = -1
m₂ = -1/-1
m₂ = 1
Jadi, gradien garis h adalah 1.