Draw Trend Line for SSRS 2005 Line Chart

Question

Hi All

    I face one major Problem in SSRS 2005 Line chart.i had the following data

X-Axis	Y-Axis
1	20
2	30
3	40
4	50
5	60

I need the trend line for the Line chart in the SSRS 2005.but that Trend function is not there for Line chart.How can i draw .i had the data for single line graph (example i had Rank detail for the individual person) by using this data only i will calculate the trend line data.i also check the the formula Y=MX+C but its applicable only for Bar chart .for bar chart only plot area should be Enable in SSRS 2005 .This is the link I was refereed http://ericung.blogspot.in/2011/07/ssrs-2005-bar-chart-adding-linear-trend.html I need the same trend line for the Bar-Chart in SSRS 2005.