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g(3)=11
3a+b=11.....(1)
g(1)=7
a+b=7....(2)
eliminasi variabel b
3a+b=11
. a+b=7
———— -
2a=4
a=2
substitusi nilai a kepersamaan (2)
a+b=7
2+b=7
b=7-2
b=5
pembuktian
g(1)=2(1)+5=7
g(3)=2(3)+5=11
jadi nilai a=2 dan nilai b=5