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m = −1/−5
m = ¹/₅
Tegak lurus
m₁ × m₂ = −1
¹/₅ × m₂ = −1
m₃ = −1 : ¹/₅ = −5
Perasamaannya
y − y₁ = m(x − x₁)
y + 4 = −5(x − 2)
y + 4 = −5x + 10
y = −5x + 6