Add and subtract matrices
Matrix \(D\) records the points scored by each team in round 1 of a school athletics carnival, and matrix \(C\) records the points scored by the same teams in round 2
In both matrices, the rows are Barton, Chisholm (top to bottom) and the columns are Relay, Sprint (left to right)
\[D = \begin{bmatrix} 3 & 11 \\ 2 & 12 \end{bmatrix}\]
\[C = \begin{bmatrix} 12 & 12 \\ 8 & 1 \end{bmatrix}\]