QlikView Trend line Linear function?

[lawrance]

Hi,

How to use default QlikView Trend Line Linear function in expression and shows legends.

Sample Data:

DATE	TOTAL MESSAGES	MSG PER SECOND
2016-11-21	8110	4.50555555555556
2016-11-22	8877	4.93166666666667
2016-11-23	10080	5.6
2016-11-28	11147	6.19277777777778
2016-11-29	10557	5.865
2016-11-30	8362	4.64555555555556
2016-12-01	6542	3.63444444444444
2016-12-02	2934	1.63
2016-12-05	9285	5.15833333333333
2016-12-06	6133	3.40722222222222
2016-12-07	9323	5.17944444444444
2016-12-08	7427	4.12611111111111
2016-12-09	9775	5.43055555555556
2016-12-12	10251	5.695
2016-12-13	9301	5.16722222222222
2016-12-14	8633	4.79611111111111
2016-12-15	8441	4.68944444444444
2016-12-16	8658	4.81
2016-12-19	9335	5.18611111111111
2016-12-20	9939	5.52166666666667

Thanks,

Lawrance. A