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y - y₁ = m(x-x₁)
Maka,
y - 3 = 4(x - 2)
y - 3 = 4x - 8
y = 4x - 8 + 3
y = 4x - 5
Atau dengan bentuk lain:
4x - y - 5 = 0
y = 4x - ( 4 × 2 - 3 )
y = 4x - 5