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y-1 = -2(x-2)
y-1 = -2x + 4
2x + y -5 = 0
semoga membantu
(y-y1) = m (x-x1)
subtitusi soal ke rumus
(y-1) = -2 (x-2)
y-1 = -2x +4
y - 5 = -2x
2x = - y + 5 atau 2x +y -5 =0