Question

Can't get my head around this at all any help would be greatly appreciated.​

Answer 1

`x=-6`

Explanation:

`A=7x-6\\B=3x+2\\For A=3B\\7x-6=3(3x+2)\\7x-6=9x+6\\2x=-12\\x=-6\\`

Answer 2

The input is -6, hope this helps :D

Explanation:

Represent the machines as expressions:

outputA= 7x-6

outputB= 3x+2

Find the input when the outputA is 3*outputB:

outputA=3outputB

(7x-6)=3(3x+2)

7x-6=9x+6

2x=-12

x=-6