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m₁ = 3
Gradien tegak lurus :
m₂ = -1 : 3
m₂ = -1/3
Persamaan garis tegak lurus :
y = -1/3x - ( -1/3 × 6 + 1 )
y = -1/3x + 1
m₁ = 3
m₁ × m₂ = -1
3 × m₂ = -1
m₂ = -1/3
y - y₁ = m(x - x₁)
y - (-1) = -1/3(x - 6)
y + 1 = -1/3x + 2
3y + 3 = -x + 6
3y = -x + 6 - 3
3y = -x + 3