Ответы на вопрос:
{5x - 4y = 13 { 2x - y = 4 { x = 13/5 + 4/5y { 2x - y = 4 2 ( 13/5 + 4/5y ) - y = 4 y = - 2 2x - ( - 2 ) = 4 x = 1 ( x, y ) = ( 1, -2 ) { 5 * 1 - 4 * ( - 2 ) = 13 { 2 * 1 - ( - 2 ) = 4 { 13 = 13 { 4 = 4 ( x, y) = ( 1, -2 ) ответ: (1; -2)
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