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atau m1 . m2 = -1 (harus cari m1= 3 ... m2 = -1/3)
melaui (6, -1) ... 3(-1)= - 6 +c..... c=6-3 = 3
pers 3y= - x + 3
3x-2y=16 .... x2 .... 6x-4y=12
2x+5y= - 2..... x3......6x+15y= - 6
------------- (+) ---------------------------- (-)
5x+3y=14 -11 y= 18