Answer:
I'd say the answer would be D) Isolate x in the first equation.
Explanation:
1 - I did it in my special calculator, and that's what I got from it.
2 - By isolating the x, you can substitute it into the first problem. For example instead of
x^2 - x + 3y = 5, you'd have
(2y - 1)^2 - (2y - 1) + 3y = 5. With that being said, you'd also have like terms (the y's).
Hope this is what you were looking for :)