Creating transfer function (using tf) with unknowns in it

How to create a transfer function with unknown constant in it.
I have function of ' sys_tf = (B) / (s + A) '
i am using 'syms' command to declare the unknowns. my code is as below.
syms a b
sys_tf = tf([b],[1 a]);
is it possible? what's wrong in this?
please help

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R2018b

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