[tex] - 2x + y = 4 \\ x + 3y = 5 \\ \\ y = 2x + 4 \\ x + 3(2x + 4) = 5 \\ \\ x + 6x + 12 = 5 \\ 7x = 5 - 12 \\ 7x = - 7 \\ x = - 7 \div 7 \\ x = - 1 \\ \\ y = 2 \times ( - 1) + 4 = - 2 + 4 = 2[/tex]
Ответ: ( - 1 ; 2 )
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[tex] - 2x + y = 4 \\ x + 3y = 5 \\ \\ y = 2x + 4 \\ x + 3(2x + 4) = 5 \\ \\ x + 6x + 12 = 5 \\ 7x = 5 - 12 \\ 7x = - 7 \\ x = - 7 \div 7 \\ x = - 1 \\ \\ y = 2 \times ( - 1) + 4 = - 2 + 4 = 2[/tex]
Ответ: ( - 1 ; 2 )