Why are virus considered to be nonliving

because it doesn't need to consume energy to survive, nor is it able to regulate its own temperature.

Explanation:

Hope it helps! ^_^

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.

: -)