Easy -1.8 This is a 1-mark multiple choice question requiring only direct recall that invariant points under a reflection lie on the mirror line. The matrix clearly shows reflection in the x-axis (y-coordinate negated), making y=0 immediate. No calculation or problem-solving required—purely recognition of a standard transformation.
1 A reflection is represented by the matrix \(\left[ \begin{array} { c c } 1 & 0 \\ 0 & - 1 \end{array} \right]\)
State the equation of the line of invariant points.
Circle your answer. [0pt]
[1 mark]
$$x = 0 \quad y = 0 \quad y = x \quad y = - x$$
1 A reflection is represented by the matrix $\left[ \begin{array} { c c } 1 & 0 \\ 0 & - 1 \end{array} \right]$\\
State the equation of the line of invariant points.
Circle your answer.\\[0pt]
[1 mark]
$$x = 0 \quad y = 0 \quad y = x \quad y = - x$$
\hfill \mbox{\textit{AQA Further AS Paper 1 Q1 [1]}}