Ответы на вопрос:
5х + 10y - 3 = x + 5 4x + 10y - 8 = 0 ///////////////////////////////// 4x - 12y - 50 + y = 0 4x - 11y - 50 = 0 ( * ( -1)) ( -4x) + 11y + 50 = 0 4x + 10y - 8 = 0 21y + 42 = 0 21y = ( -42) y = ( - 2) 4x - 20 - 8 = 0 4x = 28 x = 7 ответ: x = 7 ; y = ( - 2)
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