Trong mặt phẳng Oxy, cặp đường thẳng nào sau đây song song ?
\(d_1:x+2y+1=0\&d_2:2x-4y+3=0\) \(d_1:3x-4y+1=0\&d_2:4x+3y+12=0\) \(d_1:2x+3y+1=0\&d_2:\frac{x+2}{3}=\frac{y-3}{-2}\) \(d_1:2\frac{x-1}{-1}=\frac{y+2}{2}\&d_2:\frac{x-1}{2}=\frac{y+2}{-4}\)