To biil 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.) u is the independent variable. d.) the variables cannot be labeled without a table of values. e.) the variables cannot be labeled since any value can be selected for either.