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m = -a/b
m = -2/2
m = -1
m = -1 melalui titik (3,6)
y - y₁ = m (x - x₁)
y - 6 = -1(x - 3)
y - 6 = - x + 3
y = -x + 3 + 6
y = -x + 9
jadi jawabannya a.