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Math·Advanced Math·Nonlinear equations in one variable and systems of equations in two variables

hard

$x^2+y^2=3,185$ $y-8x=0$

A solution to the given system of equations is $(x,y)$, where $x<0$. What is the value of $y$?

A

$-392$

B

$-56$

C

$-8$

D

$-7$