A Bijection

For two sets \[X=\{x \mid -1 \leq x \leq 1\}, Y=\{y \mid 9 \leq y \leq 11\},\] a bijective function \(f: X \to Y\) is defined as \(f(x)=ax+b,\) where \(a > 0.\) What is \(ab?\)

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