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x₁ = 3
m = -1/2
y - y₁ = m(x - x₁)
y - 0 = -1/2(x - 3)
y = -1/2x + 3/2
2y = -x + 3
y₁ = -3
x₁ = -2
m = -1
y - y₁ = m(x - x₁)
y - (-3) = -1(x - (-2))
y + 3 = -1(x + 2)
y + 3 = -x - 2
y = -x - 2 - 3
y = -x - 5
Jawab ~> a) 2y = -x + 3
b) y = -x - 5