AS June 2019 Paper 1 Q1

1 Which of the following matrices is an identity matrix?

Circle your answer. [1 mark]

• \(\begin{bmatrix} 1 & 1 \\ 1 & 1 \end{bmatrix}\)
• \(\begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}\)
• \(\begin{bmatrix} 0 & 1 \\ 1 & 0 \end{bmatrix}\)
• \(\begin{bmatrix} 0 & 0 \\ 0 & 0 \end{bmatrix}\)