The graph of a direct relationship is very distinctive. If a graph is a straight line with a positive slope AND goes through the point (0, 0), then the relationship is direct. Definition: A quantity y is directly proportional to a quantity x if y = kx for some k > 0. k is called the constant of proportionality and this can be represented through a graph as shown below: Often just the term proportional is used to mean directly proportional.
History of Contiki. Contiki Holidays was founded in 1961 by John Anderson of New Zealand. The Contiki Tours began in London , and the first guided tours were booked by 19-29 year olds. Since Contiki Travel was established, it has become a worldwide leader in vacation for 18-35 year olds.
Incorporated in 1912, the town was named for a director of Consolidation Coal Company (Consol), Van Lear Black. It owes its existence to the viable efforts of John Caldwell Calhoun Mayo.