Сколько решений имеет система уравнений?

-2х+у=0
-4х+2у=6
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1) у=2х                                        2)   -2х+у=0       / *(-2)
   -4х+2у=6                                        -4х+2у=6
  Решаю неравенство                        4х-2у=0 
-4х+2(2х)=6                                       -4х+2у=6
-4х+4х=6                                              0=6
0=6