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4y = -2x +5
y = -2/4x +5/4
y = -1/2x +5/4
Maka, m (gradien) = -1/2
y -y₁ = m(x -x₁)
y -3 = -1/2(x -(-2))
y -3 = -1/2x -2/2 dikali 2 untuk menghilangkan penyebut, sehingga
2y -6 = -x -2
2y = -x -2 +6
2y = -x +4
x +2y = 4
Tidak ada jawabannya.
Koef. y × y₁ = 4 × 3 = 12
2x + 4y = ( -4 + 12 )
2x + 4y = 8
x + 2y = 4