1.7. Solving a system of linear equations

Example question: solve $\displaystyle \begin{align} x+y-z&= -0.8 \\ 2x-y+2z&=9.4 \\ x-5z &= -5 \end{align}$

Solution: $x=2.375, \; y=-1.7, \; z=1.475$

Other than for solving polynomial equations , the PolySmlt2 app in our GC can also be used to solve a system of linear equations. We access the application in our calculator and go to option 2, "Simultaneous Eqn Solver". Set the appropriate settings (3 equations and 3 unknowns for our example) and key in our system of equations as shown in the image below. Click solve to get the solution.