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-a + b = 1
f(1) = 5
a + b = 5
-a + b = 1
a + b = 5
------------- -
-2a = - 4
a = 2
a + b = 5
3 + b = 5
b = 3
2a + b
2(2) + 3
7
f(-1) = -a + b = 1
f(1) = a + b = 5
____________- eliminasi b
-2a = -4
a = 2
sub nilai a = 2 ke pers a + b = 5
2 + b = 5
b = 5 - 2 = 3
maka nilai 2a + b
= 2(2) + 3
= 7