Triangle ABC was transformed using the rule (x, y) → (–y, x). The vertices of the triangles are shown. Which best describes the transformation?

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

Solve 3x-18=2y and 5x-6y=6 by elimination show work

Solve the triangle. a = 21°, c = 105°, c = 5