When the Tom-Tom Companys controller was asked to budget the cost of manufacturing supplies for the next year, she plotted supplies cost and units produced by month for the year. She then drew a regression line through the point she plotted for November when the supplies cost was RM21,000 and 5,000 drum sets were produced.

Required: If the regression line intersected the Y axis at RM6,000, determine the equation of the regression line.