4MA0 Foundation June 2015 Paper 1 Q12
12 \(w = 4x - 5y\)
(a) \(x = 7\), \(y = 4\)
Work out the value of \(w\). (2)
Work out the value of \(w\). (2)
\(w = 4x - 5y\)
(b) \(w = 100\), \(y = 22\)
Work out the value of \(x\). (2)
Work out the value of \(x\). (2)
\(w = 4x - 5y\)
(c) \(x = 6t\), \(y = 2t\)
Find a formula for \(w\) in terms of \(t\).
Give your answer in its simplest form. (2)
Find a formula for \(w\) in terms of \(t\).
Give your answer in its simplest form. (2)
| Scheme | Marks |
|---|---|
| \(4 \times 7 - 5 \times 4\) oe or 28 or \(-20\) | M1 |
| 8 | A1 |
| (2) |
| Scheme | Marks |
|---|---|
| \(100 = 4x - 110\) or 100 + 110 (= 210) | M1 |
| 52.5 | A1 |
| (2) |
Notes
A1: or \(52\tfrac{1}{2}\)
| Scheme | Marks |
|---|---|
| \(4 \times 6t - 5 \times 2t\) oe or \(4 \times 6t\) oe and \((-)5 \times 2t\) oe | M1 |
| \(14t\) | A1 |
| (2) | |
| Total 6 marks |
Notes
A1: accept \(14 \times t\)