Determine a least square geometric curve, Mechanical Engineering

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Determine a least square geometric curve y = ax^b to the following data :

x: 1 2 3 4 5

y: 0.5 2 4.5 8 12.5

Fit a straight line y = a + bx to the following data by the process of moments :

x: 1 2 3 4

y: 16 19 23 26

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