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[tex]\displaystyle\bf \left \{ {{x + y = 5} \atop {3x + y = 7 }} \right. \\ \displaystyle\bf\\\left \{ {{1 + 4 = 5} \atop {3 \times 1 + 4 = 7 }} \right. \\ \displaystyle\bf\\\left \{ {{5 = 5} \atop {7 = 7 }} \right.[/tex]
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( 1 ; 4 )
[tex]\displaystyle\bf \left \{ {{x + y = 5} \atop {3x + y = 7 }} \right. \\ \displaystyle\bf\\\left \{ {{1 + 4 = 5} \atop {3 \times 1 + 4 = 7 }} \right. \\ \displaystyle\bf\\\left \{ {{5 = 5} \atop {7 = 7 }} \right.[/tex]