Question

Find y \(\begin{bmatrix} x & x - y \\[0.3em] 2x + y& 7 \\[0.3em] \end{bmatrix}\) = \(\begin{bmatrix} 3 &1 \\[0.3em] 8 &7 \\[0.3em] \end{bmatrix}\)

Answer 1

x = 3

x - y = 1

3 - y = 1

y = 2