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-3y = -x - 4
3y = x + 4
y = 1/3x + 4/3
m₁ = 1/3
m₁ × m₂ = -1
1/3 × m₂ = -1
m₂ = -3
Jadi gradien garis a adalah -3.
x = 3y -4
x +4 = 3y
3y = x +4
y = 1/3x +4/3
Maka, m₁ = 1/3
m₁ . m₂ = -1
1/3 . m₂ = -1
m₂ = -1 per 1/3
m₂ = -3
Jadi, gradien garis a adalah -3.