A=\left[\begin{array}{cc}
x_1 & 1 \\
\vdots & \vdots \\
x_m & 1
\end{array}\right], \quad
b=\left[\begin{array}{c}
y_1 \\
\vdots \\
y_m 
\end{array}\right], \quad
x =\left[\begin{array}{c}
\alpha \\
\beta
\end{array}\right]