It is 1033. I think they dont have a way to find a prime number based on its position :p but the answer is everywhere on the Internet.
Answer:
615.4³
Step-by-step explanation:

The answer: ( x ; y ) = ( -2 ; 6 )
Ok done. Thank to me :>
The absolute value makes the -8 into a positive 8, then you subtract the 8 on both sides, giving you your answer 7. (Since 15-8=7)