No, both of these are wrong.
The first is associative, the second is communicative.
http://www.purplemath.com/modules/numbprop.htm
Identify the properties
( 5 + 3) + 4 = ( 3 + 5) + 4 = Communitive property
( 3 × 2) × 8 = 3 × ( 2 × 8) = associative property
3 answers
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x+3y=-6
3x+9y=6
3x+9y=6