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* f(2) = a(2) + b = 16
=> 2a + b = 16
* f(-4) = a(-4) + b = -26
=> -4a + b = -26
2a + b = 16
-4a + b = -26
----------------------------- (minus)
6a = 42
a = 42 / 6
a = 7
untuk nomor 8, coba pakai cara di atas :)
terima kasih