4MA0 Foundation June 2017 Paper 1R Q7
7 Here is a number machine.
(a) Find the output when the input is 30 (1)
(b) Find the output when the input is −8 (1)
(c) Find the input when the output is 10 (1)
The input is \(x\)
The output is \(y\)
(d) Write down a formula for \(y\) in terms of \(x\). (2)
| Scheme | Marks |
|---|---|
| 100 | B1 |
| (1) |
| Scheme | Marks |
|---|---|
| −52 | B1 |
| (1) |
| Scheme | Marks |
|---|---|
| 7.5 | B1 |
| (1) |
| Scheme | Marks |
|---|---|
| \(y = 4x - 20\) oe | B2 |
| (2) | |
| (5 marks) |
Notes
B2: (B1 for \(4x\) (− 20) oe or \(x = \dfrac{y + 20}{4}\))