The pituitary gland is located in the brain and controls
a.
skin conditions
b.
the rest of the endocrine glands
c.
the regeneration of nerve cells
d.
involuntary motor skills

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.

: -)