What transformation is represented by the rule
(x, y)→(−y, x)

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.

Don't know how to find x given these segment lengths

Which graph represents the equation y =4x