2. For the bi-axial stress states listed below, draw the stress element. Calculate the principal stresses, and determine the angle from the x axis to the largest principal stress ($\sigma_1$). Draw the new stress element at the principal orientation. Don't forget to label all details.
$\sigma_x = -8 MPa$, $\sigma_y = 7 MPa$, $\tau_{xy} = -6 MPa$