Posted by Lori on Friday, March 21, 2008 at 6:24pm.
ok, but I am puzzled by your lines such as
7 7 and
20 20
When you show solutions to equations each new line should contain an equal sign separating the left side from the right side.
Inserting such lines as you have interrupts the "flow" of equations from one to the other.
In my class you would have lost a mark for "bad form".
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