5 5 I think of a number, treble it then add on 3, the result is equal to 6. Find the value of the original number I thought of.​

Let the number be x

look at photo

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)