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Verified answer
y = 6x - 1
m1 = 6
tegaklurus ---> m2 = -1/m1 = -1/6
y = ax² + 2x + 3
m2 = y' = 2a + 2
-1/6 = 2a + 2
2a = -2 - 1/6
2a = (-12 - 1)/6
a = -13/12