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y -y₁ = m ( x -x₁)
y - 1 = 4 ( x - (-4)
y - 1 = 4 ( x + 4)
y - 1 = 4x + 16
y = 4x + 16 + 1
y = 4x + 17
jawaban soal 2
m = -1 1/2
= - 3/2
y - y₁ = m ( x- x₁)
y - 2 = -3/2 ( x - 1)
y - 2 = - 3/2x + 3/2 ⇒ sederhankan X 2
2y - 4 = -3x + 3
2y = -3x + 3 + 4
2y = 3x + 7