SubArea: Systems of linear equations and inequalitiesLevel: BProject ID: 2000019009Accepted: 0Clonable: 0Easy: 0How many solutions does the following system have? \[\begin{aligned} x+y -z=3 & & \\3x -y-7z =-7& & \\x +3y +z= 11& & \end{aligned}\]infinityonethreetwo
