Solving systems of equations

Task

Solve the following system of equations:

1.	Enter the first equation into the Input Bar and press Enter.
2.	Enter the second equation into the Input Bar and press Enter.
3.	Enter the third equation into the Input Bar and press Enter.
4.	Open the context menu of the third equation and select Solve. The equations will be labeled automatically.
	Note: The solution of the system of equations will be displayed as a list showing the values of the variables x, y and z. You can press the toggle button for numeric output to show the solution in rounded decimals. Press the corresponding toggle button to change the numeric output into exact output again.