Two numbers have a sum of 19 and a difference of 9. Write a system and solve it to identify the two numbers. −14 and 5
14 and −5
−14 and − 5
14 and 5

Here are the coordinates for eight points on the coordinate plane (q > p > 0): a (0, 0), b (p, 0), c (q, 0), d (p + q, 0), e (0, q), f (p, q), g (q, q), and h (p + q, q). which four points, if any, are on the vertices of a square?