设直线l1:(m-2)x+3my+2=0,l2:x+my+6=0,若l1//l2,则m的值为多少
问题描述:
设直线l1:(m-2)x+3my+2=0,l2:x+my+6=0,若l1//l2,则m的值为多少
答
m=5
l1:y=(2-m)/3m x-2/3m
l2:y=-1/m x-6/m
l1//l2斜率相等 (2-m)/3m=-1/m
m=5