Question 3 of 10 How many hydrogen atoms are present in each water molecule?
A. 3
O B. 2
O
C. 4
D. 1
SUBINT

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.

: -)