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Persamaan 2 : (1+a)x - 6y = 7
Syarat tegak lurus m1 * m2 = -1
m1 = -2/3
m2 = (1+a)/6
m1 * m2 = -1
(-2/3) (1+a)/6 = -1
(-2-2a)/18 = -1
-2-2a = -18
2a = 16
a = 8