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Verified answer
F(x)= ax+cF(5)=21 → 5a+c=21 (x=5)
F (-3)=5 → -3a+c=5 (x=-3)
eliminasi c dari per satu dan dua menjadi 8a=16 → a=2
-3a+c=5 → -6+c=5 → c= 11
F (x) = ax + c
F (x) = 2x + 11
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