Using polyfit and polyval built-in function find out 'y' for the corresponding value of x-6, of the coordinates (3, 10), (7, 20), and (10, 30). consider first order polynomial. also write the equation of the polynomial. hints: pn-polyfit(x, y, n), where n is the degree/order of polynomial yspolyval x), y is the interpolated value of corresponding x of that polynomial