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Math·Algebra·Linear functions

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$x$	$g(x)$
1	46
2	43
3	40
4	37

For the linear function $g$, the table shows four values of $x$ and their corresponding values of $g(x)$. The function can be written as $g(x)=mx+b$, where $m$ and $b$ are constants. What is the value of $b$?

1

49