直线4X+3Y-7=0在x,y轴的截距比为3：4
设直线L在x轴截距为a,则y轴截距为4/3 a
面积=2/3a^2 = 6
a = +/- 3
L方程为4x+3y - 12 = 0
4x+3y + 12 = 0