[3y+6]>or equal to 21

If you could put this in set notation, graph, and interval notation that would be great. Thanks

3y + 6 > 21

3y > 21 - 6
3y > 15
y > 5

graph:
h t t p : / / w w w . w o l f r a m a l p h a . com/input/?i=3y+%2B+6+%3E+21