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persamaan garis melalui titik (2,5) dan m = -2
y - y1 = m(x - x1)
y - 5 = -2(x-2)
y = -2x + 4 + 5
y = -2x + 9
b) m = -1/2 dan titik(2,5)
y - 5 = -1/2(x-2)
y = -1/2 x + 1 + 5
y = -1/2 x + 6 atau
2y = -x + 12