Hi, I have the following question and I need to know if i have augmented it correctly and what my next steps should be.

Maximise

subject to

and

My steps to solve were

let

so then we have:

and

i thought this was the correct augmented form of the LPP, however, none of the multiple choice answers i can choose from show this, hence i know it is wrong, but I'm not sure what i have done wrong, all the answers have added more variables.