#### Answer

$y$;
$x$;
$2$

#### Work Step by Step

RECALL:
The slope $m$ of a line passing through the points $(x_1, y_1)$ and $(x_2, y_2)$ is equal to:
$m=\dfrac{y_2-y_1}{x_2-x_1}$
The slope of the line that passes through the points $(0, 1)$ and $(2, 5)$ is:
$m=\dfrac{5-1}{2-0}
\\m=\dfrac{4}{2}
\\m=2$
Thus, the missing expressions in the given statements are:
$y$;
$x$;
$2$