I’m taking a practice test that allows me to get my full grade up and don’t understand which one goes in which

is there a picture i can see so i can help

yeah, ill try to help, but like the first answerer said, is there a picture?

Explanation:

of those who start drinking before they're 15 will develop alcohol dependence

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.

: -)