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m = -4/-5
m = 4/5
dari persamaan 4x - 5y - 20 = 0
jika, x₁ = 0 maka y₁ = ?
4.0 - 5y₁ - 20 = 0 ⇔ -5y₁ = 20 ⇔ y₁ = -4
jika y₂ = 0 maka x₂ = ?
4x₂ - 5.0 - 20 = 0 ⇔ 4x₂ = 20 ⇔ x₂ = 5
maka nilai gradien dari persamaan tersebut sebesar