设L:y+2=k(x-3)
令y=0 x=2+3k/k
令x=0 y=-3k-2
∵两坐标轴上的截距相等
2+3k/k=-3k-2
k=-2/3 或k=-1
∴L：y+2=-2/3(x-3)或y+2=-(x-3)