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

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$y=\frac{1}{2}x+3$ One of the two equations in a system of linear equations is given. The system has infinitely many solutions. If the second equation in the system is $y=mx+b$, where $m$ and $b$ are constants, what is the value of $b$?

A

-3

B

1/2

C

-1/3

D

3