Which of these are minerals? a. iron and water b. plants and water c. gold and bauxite d. concrete and bauxite

the answer is

Explanation:

C. gold and bauxite

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.

: -)

looks like the answer is     c     to me!