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7x +4y +16 = 0
4y = -7x -16
y = -7/4x -16/4
y = -7/4x -4
maka, m = -7/4
y -y₁ = m(x -x₁)
y -(-12) = -7/4(x -(-18))
y +12 = -7/4x -126/4 dikali 4 untuk menghilangkan penyebut
4y +48 = -7x -126
4y = -7x -126 -48
4y = -7x -174
7x +4y +174 = 0
Itu jawabannya.