10th grade algebra
posted by natalie .
solve the equation 2x+y=9 for y

subtract 2x from each side.

i don't understand can you be specific please

for 2x+y=9 you do
2 2 (subtract two from both sides)
then you would get:
y=92x
(remember that when you move something to the other side you do the opposite equation)(in this case the opposite of positive is negative, so the 2x becomes negative) 
sorry subtract 2x from both sides
my mistake
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