To bill customers for water usage, one city converts the number of gallons used into units. this relationship is represented by the equation g = 748u, where g is the total number of gallons of water used and u is the number of units. determine which statements about the relationship are true. check all that apply. a. g is the dependent variable. b. u is the dependent variable. c. g is the independent variable. d. u is the independent variable. e. the two variables cannot be labeled as independent or dependent without a table of values. f. the two variables cannot be labeled as independent or dependent since any value can be selected for either.