SOLUTION: I need help on how to add and subtract polynomials. I get confused on what sign I will use on the equation like in x+2y-7-3x-4y+8 Iam not sure what sign to use in this problem plea

Question 62238: I need help on how to add and subtract polynomials. I get confused on what sign I will use on the equation like in x+2y-7-3x-4y+8 Iam not sure what sign to use in this problem please help me and please include a hint or tip on adding and subtracting polynomials
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
x+2y-7-3x-4y+8
Write the x terms then the y terms, then the number terms, as follows:
x-3x + 2y-4y -7-8
The x terms: one to the right then three to the left leaves you at -2x
The y terms: two to the right then 4 to the left leaves you at -2y
The numbers: seven to the left then eight to the left leaves you at -15
SOLUTION:
-2x-2y-15
Cheers,
Stan H.

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