UPSKILL MATH PLUS

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The function from \(A\) \(=\) \(\{\)3, 4, 8, 10\(\}\) to \(B\) \(=\) \(\{\)\(5\), \(15\), \(7\), \(19\)\(\}\)  is represented by the table below, where \(f(x)\) \(=\) \(2x\) \(-\) \(1\).
 
\(x\)
3
4
8
10
\(y\)
\(5\)
\(7\)
\(a\)
\(b\)
 
Find the values of \(a\) and \(b\).
 
\(a\) \(=\)
 
\(b\) \(=\)