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f(2) = 1
f(4) = 7
* Eliminasi
2a + b = 1 ..... (1)
4a + b = 7 ..... (2)
------------ -
-2a = -6
a = 3
* substitusi a = 3 ke pers (1)
2a + b = 1
2(3) + b = 1
6 + b = 1
b = -5
nilai a + 2b = 3 + 2(-5) = -7