Sagot :
Alttaki ifadeyi - ile çarpalım
7x+5y+z=3
-3x-y+3z=-4
Taraf tarafa toplayalım
4x+4y+4z=-1
Her iki tarafı 4’e bölelim
x+y+z= -1/4
7x+5y+z=3
-3x-y+3z=-4
Taraf tarafa toplayalım
4x+4y+4z=-1
Her iki tarafı 4’e bölelim
x+y+z= -1/4
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