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m₁ = 3 (kalau sejajar)
m₂ = -1/3 (kalau tegak lurus)
(1,3) tegaklurus
y - y₁ = m(x - x₁)
y - 3 = -1/3(x - 1)
------------------------- kali 3
3y - 9 = -x + 1
3y + x = 10