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XSadness
Hello.

The answer is −7x+20y

Simply like terms
−2x+3y−5x−−8y+9y

=−2x+3y+−5x+8y+9y

Combine Like Terms:

=−2x+3y+−5x+8y+9y

=(−2x+−5x)+(3y+8y+9y)

=−7x+20y


Have a nice day
randomuser0w0
The answer would be -7x + 20y


-2x + 3y - 5x - ( -8y ) + 9y
When there are two negative signs one after another, it turns into a positive.
-2x + 3y -5x + 8y + 9y
Now you need to add up all common numbers.
-2x - 5x = -7x
3y + 8y + 9y = 20y

The remaining two numbers don't have a common variable, so they stay separate;
-7x + 20y

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