Estimate the value of $y$ at $x=3$ by fitting the following data

$\backslash$table$[[x,1,2,4],[y,2,1\mathrm{.}6,1\mathrm{.}3]]$

a$)$ With a Newton divided difference interpolating polynomial.

b$)$ With a power equation $y=a{x}^b$ by linearizing the equation and employing linear regression.