Q:

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:

The way that one says $$\{(x,y)|x+y\leq 1\}$$
in spoken word is 

The set of all ordered pairs 'x comma y', such that x plus y is less than or equal to 1.