已知两直线L1:4x+(3+m)y+3m-5=0,L2:(5+m)x+2y-8=0,(1)当M为何值时,L1//L2;(2)当M为何值时,L1⊥L2

问题描述:

已知两直线L1:4x+(3+m)y+3m-5=0,L2:(5+m)x+2y-8=0,(1)当M为何值时,L1//L2;
(2)当M为何值时,L1⊥L2