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Math·Algebra·Linear functions

hard

$x$	$r(x)$
−41	−6
−21	0
−1	6

For the linear function $r$, the table shows three values of $x$ and their corresponding values of $r(x)$. Function $r$ is defined by $r(x)=ax+b$, where $a$ and $b$ are constants. What is the value of $a+b$?

1

6.6

2

33/5