Some plants lose their leaves and go dormant during hot, dry summers. What happens to these plants' life processes during dormancy? How does this help the plants survive?

Explanation:

Dormancy is when a plant just stop growing and development. that doesn't mean they stop completely, while other part of plants are stopped developing, the root continue to develop and thrive to get more nutrients.  

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.

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not sure if this what   you'r looking for would be percent composition