Let
x ----> number of adults tickets
y ---> number of students tickets
we have
x+y=200 -----> equation A
6x+4y=1,064 -----> equation B
matrix equation
[tex]\begin{bmatrix}{1} & {1} \\ {6} & {4}\end{bmatrix}\begin{bmatrix}{x} & {} \\ {y} & \end{bmatrix}=\begin{bmatrix}{200} & {} \\ {1,064} & {}\end{bmatrix}[/tex]