How do I select composite array element that satisfy specific conditions.

[a]

Hi, say if I have composite type and table 


create type A as(
     x float8,
     y float8
);

create table B(
     Ay A[]
);

insert into B
values(array[
     (1,2)::A,
     (3,4)::A]
);


How could I select the element of Ay that satisfy x=3??


Thank you so much!!


Shore