Question

Combining like terms although there has to be two terms
y-9+y-4

Answer 1

Explanation:

Here, "combining like terms" would require y + y -9 - 4, or 2y - 13. Order is unimportant here.

Answer 2

2y - 13

Explanation:

y - 9 + y - 4

2y - 9 - 4

2y - 13