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f(4)=4a+b=4
eliminasi dikurangi hasilnya -2a=-1 maka a=1/2
substitusi 2a+b=3 maka 2 x 1/2 +b = 3 maka 1 +b = 3 maka b =2
f(x)= 1/2 x + 2
nilai f(-2)= 1/2 -2 + 2 = -1+2=1
nilai f(3)= 1/2 -3 + 2 = -3/2+2=1/2
f(-2)+f(3)=1+1/2 =3/2=1 1/2