A dark colored rock composed of smaller pieces of irregularly shaped rock. Classify this rock by using the drop-down menus to describe the size, shape, and pattern of its grains. Grain size: Grain shape: Grain pattern:

Coarse-grained, jagged, non-banded

Explanation:

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.

: -)