1MA0 Foundation June 2012 Paper 2 Q14

EdexcelFoundationOld spec4 marksSubstitution

14 \(P = 3.5x - y\)

(a) Work out the value of \(P\) when \(x = 12\) and \(y = 5\) (2)

(b) Work out the value of \(P\) when \(x = -9\) and \(y = -6\) (2)

Working	Answer	Mark	Notes
\(3.5 \times 12 - 5\)	37	2	M1 for \(3.5 \times 12 - 5\) or \(42 - 5\) A1 cao

Mark scheme (b)

Working	Answer	Mark	Notes
\(3.5 \times -9 - -6\)	\(-25.5\)	2	M1 for \(3.5 \times -9 - -6\) or \(3.5 \times -9 + 6\) or sight of \(-31.5\) A1 for \(-25.5\) or \(-\frac{51}{2}\) or \(-25\frac{1}{2}\)