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Question:

What is the simplest way to write the following expression?
5x – 2y + 4x + y

A 9x – y
Explaination

Add the coefficients of the ‘x-terms’ together as follows: 5x + 4x = 9x
Add the coefficients of the ‘y-terms’ as follows: –2y + y = –y
Put the x- and y-terms back into the same equation: 9x – y.