5x - 4y = 10 /*(-3)2x - 3y = - 3 /*4- 15x + 12y = - 308x - 12y = - 12-------------------------- + - 7x = - 42x = 6y = (5*6 - 10)/4 = 5Ответ ( 6; 5)======================================4a + 6b = 9 /*33a - 5b = 2 /*(-4)12a + 18b = 27- 12a + 20b = - 8-------------------------- + 38b = 19b = 0,5a = (9 - 6*0.5)/4 = 1,5Ответ a = 1,5; b = 0,5=========================================9m - 13n = 22 /*22m + 3n = - 1 /*(-9)18m - 26n = 44- 18m - 27n = 9------------------------- + - 53n = 53n = - 1m = (22 - 13)/9 = 1Ответm = 1; n = - 1