Here is a number machine.
Input → ×4\times 4×4 → -15 → Output
What is the output when the input is 6?
What is the input when the output is 13?
Show that there is a value of the input for which the input and the output have the same value.
Practise Edexcel GCSE Maths Function Machines with exam-style questions for Foundation and Higher tier. 39 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.