Please solve this by using the "Least Squares Method"

P.S. Don't use any programs.

The following measurements were taken in the calibration between flow rate and flow meter reading [30]. Flow rate, V (L/min) Flowmeter reading (R) 34.8 10 64.8 20 154.8 50 214.8 70 . 274.8 90 a) Draw the V-R calibration curve. b) If the flow meter reading (R) is 58, what is the flow rate