Dear Mr. Das,

You can use the R Stat Software to set the fit line for the multiple variables using performanceAnalyst packages and generate the MLR model easily as per your requirements. You can check this link. Best wishes with regards.

https://youtu.be/igPQ-pI8Bjo

@Gautam Kumar Das

Your question is regression fit line in multiple regression....

Actually is it not possible to fit a regression line for multiple regression......we are able to fit regression line when one is dependent and one is independent variable...but when we have one dependent and more than one independent variable, we can't fit a regression line.... we have to chose the model based on r square, rmse etc.. but you can do other plot such as normal q-q, residual vs fitted, residual vs leverage etc...

You can do also correlation matrix for to know correlation each other...

But using 3 dimensional plot we can plot the variable but we can't fit the regression line....

But one thing you can do here, after predicting independent variable(y hat) using multiple regression, you can plot the observed y vs predicted y...

@Dipankar Bera

Yes, you are right. Only solution is to plot such q-q plot, residual vs best fitted and etc. Regression fit line for multiple variables is not possible but #Goutam Kumar Das sir you can use MLR model using R-Stat software to show plot in a single frame that helps to fit the regression line for each (One X as dependent variable and one Y as independent variable).