Corrine wrote temperatures in degrees celsius and the equivalent temperatures in degrees fahrenheit. equivalent temperatures celsius –10 5 10 20 fahrenheit 14 41 50 68 which explains how corrine could determine if the temperatures vary directly? compare the equivalent temperatures as a ratio; if the ratios are equivalent, then the temperatures vary directly. draw a graph of the temperatures; if the points form a straight line, then the temperatures vary directly. write an equation that converts one temperature to another; if the temperatures satisfy the equation, then they vary directly. look for a pattern in the table; if the pattern is consistent, then the temperatures vary directly.