Activity 6: You are testing an electrical device which can be modelled by the following equations: I + 212 + 313 = 12 211 + I2 + 2I3 = 10 31, + 212 + 213 = 14 1. Find I, 12, and I3 using the Gaussian elimination method. 2. Rearrange the previous equations in matrix form and find its determinant.