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f(2) = ax + b
8 = 2a+ b -- 1
f(-1) = ax + b
3 = -a + b -- 2 -- dikali 2 nantinya
6 = -2a+b
8 = 2a+b
_________ -
-2 = -4a
a = 2
masuk ke persamaan 1
8 = 2(2) + b
8 = 4 + b
b = 4
f(5) = ax + b
f(5) = 2(5) + 4
f(5) = 10 + 4
f(5) = 14
tapi gada di option :v