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August 20, 2014

August 20, 2014

Posted by **^^^^kesha** on Saturday, June 9, 2012 at 10:08am.

so 3a+6=4a I added 3a to 4a/ =7a

and answer was 1(answer is 6) i just dont understand how and why we subtract 3a from 4a instead of adding. please help me

- algebra -
**MathMate**, Saturday, June 9, 2012 at 11:26amYou have got:

3a+6=4a

but we know that

3a =3a

So subtract one equation from the second,

3a+6-3a = 4a-3a

which gives

6 = a

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