first of all, we should know the following definitions:
if a system of equations has exactly one solution it is called independent
if a system of equations has at least one solution it is called consistent
if a system of equations has infinite solution it is called dependent
in our case we have
-2x - y = 9
3x -4y = -8
-11x= -28, x =28 /11 and y= 9-56/11 the system has at least one solution, the system is called consistent
