Given ( A = left [ begin matrix x + y & - 6 a b & 7 end matrix right ] quadand quad B = left [ begin matrix - 3 & a + b - 9 & x + y end matrix right ] , ) where A T +B T =I. What a

A = \left [ \begin{matrix} x + y & - 6 \\ a b & 7 \end{matrix} \right ] \quad\text{and}\quad B = \left [ \begin{matrix} - 3 & a + b \\ - 9 & x + y \end{matrix} \right ] ,

IUT 21-22

A = \left [ \begin{matrix} x + y & - 6 \\ a b & 7 \end{matrix} \right ] \quad\text{and}\quad B = \left [ \begin{matrix} - 3 & a + b \\ - 9 & x + y \end{matrix} \right ] ,

IUT 21-22

Given ( A = left [ begin matrix x + y & - 6 a b & 7 end matrix right ] quadand quad B = left [ begin matrix - 3 & a + b - 9 & x + y end matrix right ] , ) where A T +B T =I. What are the values of a and b?