[tex]y - x = 20 \\ 2x - 15y = - 1 \\ \\ y = x + 20 \\ 2x - 15(x + 20) = - 1 \\ \\ 2x - 15x - 300 = - 1 \\ - 13x = - 1 + 300 \\ - 13 x = 299 \\ x = 299 \div ( - 13) \\ x = - 23 \\ \\ y = - 23 + 20 = - 3[/tex]
Ответ: ( - 23 ; - 3 )
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[tex]y - x = 20 \\ 2x - 15y = - 1 \\ \\ y = x + 20 \\ 2x - 15(x + 20) = - 1 \\ \\ 2x - 15x - 300 = - 1 \\ - 13x = - 1 + 300 \\ - 13 x = 299 \\ x = 299 \div ( - 13) \\ x = - 23 \\ \\ y = - 23 + 20 = - 3[/tex]
Ответ: ( - 23 ; - 3 )