OCR MEI FP1 2013 June — Question 3

Exam BoardOCR MEI
ModuleFP1 (Further Pure Mathematics 1)
Year2013
SessionJune
Topic3x3 Matrices

3 You are given that \(\mathbf { N } = \left( \begin{array} { r r r } - 9 & - 2 & - 4
3 & 2 & 2
5 & 1 & 2 \end{array} \right)\) and \(\mathbf { N } ^ { - 1 } = \left( \begin{array} { r r r } 1 & 0 & 2
2 & 1 & 3
- \frac { 7 } { 2 } & p & - 6 \end{array} \right)\).
  1. Find the value of \(p\).
  2. Solve the equation \(\mathbf { N } \left( \begin{array} { c } x
    y
    z \end{array} \right) = \left( \begin{array} { r } - 39
    5
    22 \end{array} \right)\).