The cost-volume formula showing the relationship between repair costs y and machine hours x came out as follows: y'= $500 + $OSOx, where y'= estimated repair costs. Identify the amount or the symbol that represents each of the following:
(a) the dependent variable,
(b) the independent variable,
(c) the slope of the regression line,
(d ) the fixed portion of repair costs,
(e) the variable portion of repair costs per machine hour, and (f)the estimated repair cost if the planned machine hours used are 1,000 hours.