D and E are sets of real numbers defined as D= {yly<=3} E= {yly<8}

Question

How do I find the D∪E and the D∩E of the sets in interval notation?

Answer 1

In simpler terms, D says y  ≤ 3, E says y <8.

 

D∪E is y < 8

 

D∩E is y ≤ 3. Includes points only that are in BOTH D AND E.