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I have taken a sample from a river contaminated with a drug Y in x amounts. I am using standard addition to quantify the amount of Y in the sample. I have added increasing amounts of Y (1-9) mg/ml to the water sample. The samples were filtered through 0.2 uM filter. The samples were undiluted. They were processed as received. Calculate the value of x to 5 decimal places.
| Concentration (mg/mL) | Detector response | 
| 0 | 1,1 | 
| 2 | 1,2 | 
| 3 | 1,4 | 
| 4 | 1,5 | 
| 5 | 1,6 | 
| 6 | 1,8 | 
| 7 | 1,9 | 
| 8 | 2 | 
| 9 | 2,1 |