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rumus cepat
-3y - (-x) = -3y + x
-3y + x = -3y + x
-3y + x = -3 (5) -2
-3y + x = -15 -2
-3y + x = -17
a = 1
b = -3
c = 6
m₁ = -a/b
= -1/-3
= 1/3
m₁ × m₂ = -1
1/3 × m₂ = -1
m₂ = -3
y - y₁ = m(x - x₁)
y - 5 = -3(x - (-2))
y - 5 = -3(x + 2)
y - 5 = -3x - 6
y = -3x - 6 + 5
y = -3x - 1
Atau bisa juga dirubah ke dalam bentuk ax + by = c menjadi 3x + y = -1