SOLUTION: I am a 52 year old mother trying to remember how to work this problem and failed to help my LD 12 year old. Problem 1: (5x-7y) + (16x + 8y) Problem 2: (7n + 2t) + (4n - 3t) I wou

Algebra ->  Equations -> SOLUTION: I am a 52 year old mother trying to remember how to work this problem and failed to help my LD 12 year old. Problem 1: (5x-7y) + (16x + 8y) Problem 2: (7n + 2t) + (4n - 3t) I wou      Log On


   



Question 31111: I am a 52 year old mother trying to remember how to work this problem and failed to help my LD 12 year old.
Problem 1: (5x-7y) + (16x + 8y) Problem 2: (7n + 2t) + (4n - 3t)
I would appreciate any help to at least get started, it's been 2 long.

Answer by Cintchr(481) About Me  (Show Source):
You can put this solution on YOUR website!
+%285x-7y%29+%2B+%2816x+%2B+8y%29+ since you are adding ... just add the like variables.
+5x+%2B+16x+=+21x+
+-7y+%2B+8y+=+1y+
+21x+%2B+1y+
Problem 2
+%287n+%2B+2t%29+%2B+%284n+-+3t%29+ drop the parenthesis
+7n+%2B+2t+%2B+4n+-+3t+ combine like terms
+11n+-+1t+
now just dropping the parenthesis ONLY works if adding. If subtracting you have to worry about changing the signs of everything AFTER the subtraction