We observe m positions ((x1,y1),...,(xm,ym)) of appoint moving in the plane (m≥2), and assume that the y are roughly on a straight line. Prove that the liney = c+d x that minimizes the error Is the...

We observe m positions ((x1,y1),...,(xm,ym)) of appoint moving in the plane (m≥2), and assume that the y are roughly on a straight line. Prove that the liney = c+d x that minimizes the error

Is the line of equation

Where