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Perubahan pecahan ~> -1 1/2 = -3/2
Persamaan ~> y - y₁ = m(x - x₁)
y - 2 = -3/2(x - 1)
y - 2 = -3/2x + 3/2
y = -3/2x + 3/2 + 2
2y = -3x + 3 + 4
2y = -3x + 7
y = -3/2x + 7/2
Jadi, persamaan garisnya adalah y = -3/2x + 7/2.