Ques- D= f (PX) is a general form of demand function, does not explain the nature and magnitude of the relationship between dependent and independent variable? How will you explain bivariate and...

Ques- D= f (PX) is a general form of demand function, does not explain the nature and magnitude of the relationship between dependent and independent variable? How will you explain bivariate and multivariate demand functions with reference to price, income, price of related goods (substitute goods in specific linear and in-linear form of demand function?