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Math·Algebra·Systems of two linear equations in two variables

hard

In the given system of equations, $a$ and $b$ are constants. The graphs of these equations in the $xy$-plane intersect at the point $(x,4)$. What is the value of $b$? $ax-by=52$ $2ax-8y=48$

A

$3$

B

$4$

C

$-8$

D

$-3$