instructions: drag each statement to the correct location. classify the items based on whether they are or are not matter. matter or not matter toothpaste happiness gasoline sound bacteria      

all except sound and happiness!

Explanation: Because it isn't something you can see or touch where as sound you can hear it not touch or see it and happiness doesn't count because you can't see or touch happiness

good luck

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)