Solve each equation for x and y where x and y are real numbers
1+(x+y)i=y+3xi
The real part of 1+(x+y)i is 1. The imaginary part of 1+(x+y)i is x + y. The other side is left for you.
Personally, I don't think you're ready to attempt a question like the one you posted. I suggest you go back and thoroughly review the basic material that this question expects you to know.