Screen reader help for "the region {(x, y)|x + y ≤ 1}" (Series of screen reader related questions on basic symbology)
"the probability that x, y are in A where A is the region {(x, y)|x + y ≤ 1}."
How should I write this out the bolded section to that a screen reader will read it correctly?

$A$ is 

the region in the plane consisting of the points whose $x$- and $y$-coordinates satisfy the inequality $x+y\le 1$.

