2. Use Matlab to solve the following linear equation. 15x1-7x2 + 29-0 5x2 +9x3 +40-0 2xi +6x2-7x3 20-0 Requirement (1) Manually type the matrix and Matlab command; (2) Manually type the final solution. 3. It is known that at 200 C, the 2d and 3nd virial coefficient of isopropyl alcohol steam B+-0.388 m/kmol, C-0.026 m6/kmol2 The compressibility, Z-1+B/V+CV Calculate the volume (m/kmol) and the compressibility of isopropyl alcohol at 2 and 1 MPa Requirement: (I) Manually type Matlab command, equations and the initial value or the search rang that you use (2) Manually type the final solution. (3) Brief describe the method that you use