Answer
$y-x=-\frac{1}{2}$
Work Step by Step
When $x=-\frac{3}{10}$ and $y=-\frac{8}{10}$:
$y-x$
$=-\frac{8}{10}-(-\frac{3}{10})$
$=-\frac{8}{10}+\frac{3}{10}$
$=-\frac{5}{10}$
$=-\frac{1}{2}$
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