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F(4) = a.4 +b = 19
F(4) = 4a + b = 19 ...... 1).
F(x) = ax + b
F(2) = a.2 + b = 7
F(2) = 2a + b = 7 ..... 2).
Dari 1) dan 2)
4a + b = 19
2a + b = 7
Dikurangi
2a = 12
a = 12 : 2
a = 6
4a + b = 19
4.6 + b = 19
24 + b = 19
b = 19 - 24
b = -5
F(x) = 6x - 5
Maaf kalau salah :)