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I. m = 2/3
II. m = -1/2
III. m = 2
IV. m = 1/2
jd yg tgk lurus II & III...
1. m=2/3
2. m=-1/2
3. m=2
4. m=1/2
tegak lurus jika m1 x m2=-1
jadi (2) dan (3) saling tegak lurus karena m1.m2= - 1/2 . 2 = -1