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Answer:
Kindly check explanation and attached picture 
Step-by-step explanation:
Given the time-series data:
Time (x) : 1 - - 2 - - 3 - - - 4 - - - 5 
Data (yt) :6 - - 11 - - 9 - - 14 - - 15
The pattern which exists within the data is a linear pattern which could be inferred through the observable decrement and Incremental change in the y values at a steady or constant rate with time. The second attachment shows the linear trend line of the data. 
 
        
             
        
        
        
A is 11 and b is 16. for b you would plug in what you got for a for x
        
             
        
        
        
2.6925 is the mean/ avg you add all the numbers and divide by the amount of numbers you added