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f(5) = 8............5a + b
5a + b = 8
5a + (-2a) = 8
3a = 8
a = 8/3
b= (-2) x 8/3
= 16/3
f(10) = ax +b
= 8/3.10 + 16/3
= 80/3 + 16/3
= 96/3
= 32
f(2) = 5
f(2) = a(2) + b = 5
f(2) = 2a + b = 5
f(5) = 8
f(5) = a(5) + b = 8
f(5) = 5a + b = 8
dieliminasi di sibtitusikan
2a + b = 5 2a + b = 5
5a + b = 8 2(1) + b =5
dikurangi 2 + b = 5
-3a = -3 b = 5 - 2
a = 1 b = 3
f(10) tinggal masukkna
f(10) = ax + b
f(10) = 1(10) + 3
f(10) = 10 + 3
f(10) = 13