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.
Looking back on more than 200 years. Innovating for the next 200. Roll over the images to discover two centuries of Citi's history. And the history we're working to make right now. City Bank of New York was born in 1812, beginning our 200-year history. In 1956, National City Bank helped finance the creation of cargo containers. In 1948, Citi supported the implementation of the Marshall Plan. Roosevelt, in 1904. In 2011, Citi teamed up with Google and MasterCardTM PayPassÂ® to pioneer Google Wallet.