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a= -3
f(b)=2.(b)+5=1
=2.(b)=1-5
=b = -4÷2= -2
maka a+b= -3+ -2= -5
f(-4) = a
a = 2(-4) + 5
a = -8 + 5
a = -3
Cari nilai b :
f(b) = 1
1 = 2b + 5
2b = 1 - 5
2b = -4
b = -2
Maka,
a + b = -3 + (-2)
= -5