4MA0 Foundation January 2013 Paper 2 Q13
13
\[A = 5c - d\](a) Work out the value of \(A\) when \(c = 1.6\) and \(d = -2\) (2)
(b) Work out the value of \(c\) when \(A = 1\) and \(d = 2\) (3)
| Scheme | Marks |
|---|---|
| \(5 \times 1.6 - -2\) or \(5 \times 1.6 + 2\) or 8 or +2 | M1 |
| 10 | A1 |
| (2) |
Notes
M1: for correct evaluation of one term ie 8 or 2 or complete correct substitution into rhs
A1: cao
| Scheme | Marks |
|---|---|
| \(1 = 5c - 2\) | M1 |
| \(5c = 3\) | M1 |
| \(\dfrac{3}{5}\) or 0.6 | A1 |
| (3) |
Notes
M1: for correct substitution (may be implied by second M1)
M1: for correct rearrangement