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f(3) = 3a + b = 18
yg atas dikali 3,yg bwah kali 1
3a + 3b = 24
3a + b = 18 yg atas dikurangi yg bwah
2b = 4
b = 2
f(1) = 1a + 2 = 8
1a = 8 - 2
a = 6