Active transportation requires the use of: Lipids
Energy
Diffusion from High to Low Concentration
lons

energy

Explanation:

because the substance moves from a low to high concentration

the answer is golgi apparatus

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.

: -)