3. think it through a federal agency has put you in charge of responding to the zebra mus sel invasion. based on what you've learned in this lesson, how would you try to control the mussel's spread and impact?

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.

: -)

i think that it is c, d, and e, hope this