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8x+5y-4 and 4x-3y-9

I need the answer to this it's not for school just for a project problem

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I'd give you an answer, but you haven't told me what the question is.  Are the expressions part of a system of equations to be solved?  If so, what does each expression equal? 
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1 Answer

I'm guess that you are requesting the sum of the polynomials. if you combine the like terms you get:
 
8x + 4x = 12x
5y - 3y = 2y
-4 + -9 = -13
 
12x + 2y - 13