Solve the given system of linear equations, then check your solution.[br][br](You can also [i]zoom in[/i] and [i]out [/i]to view details.)
Why is this system called [i]linear[/i] ?
Which conditions allow you to decide [i]a priori[/i] whether a linear system has [i]a single unique solution / infinitely many solutions / no solution[/i]?[br]
Write the equations of a system having a single unique solution, one with infinitely many solutions, and one having no solution.