Forms of carbon include coal, charcoal, and

diamond

Explanation:

diamonds have carbon properties on their components.

Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. At room temperature and pressure, another solid form of carbon known as graphite is the chemically stable form, but diamond almost never converts to it.

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)