GCSE Secondary Maths Age 13-17 - Number: Number machines - Explained

The video tutorial explains a number machine that multiplies an input by 3 and subtracts 4 to produce an output. It covers three parts: calculating the output for a given input, reversing the process to find the input for a given output, and finding an input where the input and output are equal. The tutorial uses examples and algebraic methods to solve these problems, emphasizing understanding of input-output machines and reversing operations.

What is the output when the input is 4 in the number machine?

How do you find the input when the output is 11?

Explain the process of reversing the operations in the number machine.

Show that there is a value of the input for which the input and the output are the same.

What value of x satisfies the equation 3x - 4 = x?