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Math·Algebra·Linear functions

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$x$	$y$
0	$n$
4	$n+13$
8	$n+26$

There is a linear relationship between $x$ and $y$. The table shows three values of $x$ and their corresponding values of $y$ in terms of a constant $n$. What is the slope of the line that represents this relationship in the $xy$-plane?

1

13/4

2

3.25