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f(2) = 2a +b = 11
Eliminasi -3a = -9; a= 3
subtitusi -3 + b = 2; b= 5
jadi f(x)=3x+g
f(2) = 2a + b= 11
------------------- (dikurang)
-3a = -9
a = 3
untuk mencari b, tinggal memasukkan angka dr salah satu fungsi
f(-1) = -1(3) + b = 2
= -3 + b = 2
b= 2/3