Question: can you please explain b1 formula. i dont understand how he got 3480. i understand the chart on the right please show step by step

can you please explain b1 formula. i dont understand how he got 3480. i understand the chart on the right please show step by step how he got 3480 in the B1 formula only

Linear Trend Regression Linear Trend Regression t=45/9=5Y=3480/9=386.667b1=i=1n(tt)2i=1n(tt)(YtY)=603480=7.12b0=Yb1t=386.6677.12(5)=351.07

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