Помогите пж решить систему уравнений!
1)[tex] \left \{ {{x+y=4} \atop {x-y=2}} \right. [/tex]
2)[tex] \left \{ {{x+y=3} \atop {3y-x=1}} \right. [/tex]
3)[tex] \left \{ {{|x|+y=5} \atop {x+4y=5}} \right. [/tex]
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