UPSKILL MATH PLUS

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Let \(A = \{-1, 1\}\) and \(B = \{0, 2\}\). If the function \(f : A \rightarrow B\) defined by \(f(x) = ax + b\) is an onto function? Find \(a\) and \(b\).
 
\(a\) \(=\)
 
\(b\) \(=\)