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11=-3.a + b
3=a+b
11=-3a+b
kita eliminasi , maka didapat
-8=4a
a=-2
substitusi lg ke 3=a+b
3=-2+b
b=5
f(1)=3 ==>a(1)+b=3=a+b=3
f(-3)=11==>a(-3)+b=11=-3a+b=11
eliminasi
a+b =3
-3a+b=11
--------------- -
4a = -8
a = -8/4= -2
substitusikan
a+b =3
-2+b=3
b =3+2
b =5