2023 NJC P1 Q1

2023 NJC P1 Q1

6 marks
Prelims

The equations of three planes \({{p}_{1}}\), \({{p}_{2}}\) and \({{p}_{3}}\) are

\(4x+6y-z=3\)
\(2x+5y-2z=1\)
\(\alpha x-3y+4z=\beta \)

respectively, where \(\alpha \) and \(\beta \) are constants.

  1. Given that \(\alpha =5\) and \(\beta =9\), find the coordinates of the point that lies on all three planes.[1]
  2. Find the values of \(\alpha \) and \(\beta \) such that the line where \({{p}_{1}}\) and \({{p}_{2}}\) meet lies in \({{p}_{3}}\).[5]

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Answer:(a) \((2,-1,-1)\) (b) \(\alpha=2\), \(\beta=3\)

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