O-LevelMathematicsAlgebra and graphs4024/12 · Oct/Nov 2014 · Q265 Marks
A = (3 1 / -1 2) A⁻¹ = k (2 -1 / 1 3)
- (a)Find the value of k.[1]
- (b)Find the matrix X, where 2A + X = (5 -2 / 0 4).[2]
- (c)Find the matrix Y, where YA = (6 2).[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [1] (a) 1/7
- [2] (b) (-1 -4 / 2 0)
- [2] C1 for 2 or 3 correct elements.
- [2] (c) (2 0), or (14 × their (a) 0) ft
- [2] M1 for ( Y =) (6 2) A⁻¹ seen. If (x y) A = (6 2) is used, then award M1 at the stage where an attempt to solve the simultaneous eqns. is made.
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