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9y = x + 5
y = (1/9)x + 5/9
m₁ = 1/9
m₂ = - 9
Persamaan Garis
y - b = m(x - a)
y - 6 = - 9(x + 2)
y - 6 = - 9x - 18
9x + y + 12 = 0