Răspuns :
A(-1;0) ∈Gf=> f(-1)=0
f(-1)=-1 ==>-a+b=0
=-a+b
B(1;4)∈Gf=>f(1)=4
f(1)=ax1+b ==>a+b=4
=a+b
din -a+b=0
a+b=4
/ 2b=4
b=4/2
b=2
a+b=2
a+2=2
a=2-2
a=0
f(-1)=-1 ==>-a+b=0
=-a+b
B(1;4)∈Gf=>f(1)=4
f(1)=ax1+b ==>a+b=4
=a+b
din -a+b=0
a+b=4
/ 2b=4
b=4/2
b=2
a+b=2
a+2=2
a=2-2
a=0