Here are two number machines a and b
both machines have the same input x
work out the input that makes the ouput of a 3 times the output of b

a) input: x → times 5 → -4 output:
b) input: x → times 3 → +8 output:

Step-by-step explanation:

We can write them both like functions like this

Where

x=input

A=Output A

B=Output B

We want the output of A 3 times the output of B this can be written like this:

we replace with the functions

we solve for x

The output that makes the out put of A 3 times teh output of B is

b.my answer is b.

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