1.
If the system of equations
x+2y+3z=34x+3y−4z=48x+4y−λz=9+μ\begin{aligned} x + 2y + 3z &= 3 \\ 4x + 3y - 4z &= 4 \\ 8x + 4y - \lambda z &= 9 + \mu \end{aligned}

has infinitely many solutions, then the ordered pair (λ,μ)(\lambda, \mu) is equal to: