(1)可设L1:4x-2y+C=0,
它过点(1,-3),故4×1-2×(-3)+C=0→C=-10.
∴L1:4x-2y-10=0→2x-y-5=0.
(2)可设L2:2x+4y+C=0,
它过点(-2,0),故2×(-2)+4×0+C=0→C=4.
故L2:2x+4y+4=0→x+2y+2=0.
(1)可设L1:4x-2y+C=0,
它过点(1,-3),故4×1-2×(-3)+C=0→C=-10.
∴L1:4x-2y-10=0→2x-y-5=0.
(2)可设L2:2x+4y+C=0,
它过点(-2,0),故2×(-2)+4×0+C=0→C=4.
故L2:2x+4y+4=0→x+2y+2=0.