What is a virus?
A. Mutated DNA
B. An infection in your blood
C. non-living particle made up of hereditary material and protein
D. non-living organism made up of 2 cells

An infection in your blood or  a piece of code which is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data.

A- Mutated DNA

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.

: -)

silty loam

hope this