If \(A=\left[\begin{array}{ll}1& 2a\\ -8 & b+1\end{array}\right]\) and \(B=\left[\begin{array}{ll}1 &-6\\ -8 &13\end{array}\right]\) are equal matrices, then the value of \(a\) and \(b\) are respectively

\(-3,6\) \(-3,4\) \(-3,12\) \(-3,6\)

\(-3,12\)

Two matrices are equal if and only if they are equal entry wise. 2a = -6 a = -3 b + 1 = 13 b = 13 - 1 = 12