Verified answer

How would you combine to simplify two cats + a dog + a cat - 9 + three dogs?

Three cats + four dogs - 9.

What is that? Don't know. Don't have to. Still works.

You do exactly the same with exes and wyes.

.

You add the x's to the x's and the y's to the y's

2x+y+x-9+3y

2x+x= 3x y+3y=4y

3x+4y-9

That is your answer.

Put ones that are the same together

4y + 3x -9

This is a math question, which somehow got routed to the astronomy area. You should re-enter the question and ensure it is routed to a more appropriate (maybe mathematics) area.

extremely tough situation look into from google and yahoo it will help