7+y=2y plz help

Question

7+y=2y plz help

anonymous · Answer

Subtract y from both sides. Then what do you get?

anonymous · Answer

nice wombat^ he is right

anonymous · Answer

i just started this i am going to fail if i dont get it

anonymous · Answer

wat do u mean

anonymous · Answer

Ok.  Well when you see something like "2y" this means that there are two y's.  So you can treat "2y" as "y+y" because there are two y's in "y+y".  Does that make sense?

anonymous · Answer

yea so how do get a number out of letters

anonymous · Answer

Well pretend each y is a finger on your hand.  When you have two of them, instead of representing it as "y+y", you can write "2y", which is shorter to write as you progress.

anonymous · Answer

so wat do u do next

anonymous · Answer

So if you have:

7 + y = 2y

you can rewrite it as

7 + y = y + y

then you can subtract.  What you do to one side of the equation must be done to the other to keep the statement true.  So we are going to subtract y from both sides:

7 + y = y + y
    - y       - y

and you end up with 
 
7 = y