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Persamaan ~> y - y₁ = m(x - x₁)
y - 1 = 4/7(x - (-4))
y - 1 = 4/7(x + 4)
y - 1 = 4/7x + 16/7
y = 4/7x + 16/7 + 1
7y = 4x + 16 + 7
7y = 4x + 23
y = 4/7x + 23/7
Jadi, persamaan garisnya adalah y = 4/7x + 23/7.