直线mx+2y-1=0与直线3x~y+1=0垂直,求m
问题描述:
直线mx+2y-1=0与直线3x~y+1=0垂直,求m
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答
mx+2y-1=0的斜率是(-m/2),3x-y+1=0的斜率为3,两直线垂直,
(-m/2)*3=(-1),则m=6