Решениеa) {15y + x = 29 {2x - 3y = - 8{x = 29 - 15y{2*(29 - 15y) - 3y = - 8{x = 29 - 15y{58 - 30y - 3y = - 8{x = 29 - 15y{58 - 33y = - 8{x = 29 - 15y{33y = 58 + 8{x = 29 - 15y{33y = 66{x = 29 - 15y{y = 2{x = 29 - 15*2{y = 2{x = - 1{y = 2Ответ: (- 1;2)б) {3IxI + 2y = 2 {3x - y = 41) {3x + 2y = 2 умножим на (-1) {3x - y = 4 {-3x - 2y = - 2 { 3x - y = 4Складываем - 3y = 2{y = - 2/3{3x + 2/3 = 4{3x = 4 - 2/3{y = - 2/3{3x = 3(1/3){y = - 2/3{x = 1(1/9){y = - 2/3Ответ: (1(1/9); - 2/3)2) {- 3x + 2y = 2 { 3x - y = 4Складываем{y = 6{3x - 6 = 4{3x = 10y = 6{x = 3(1/3){y = 6Ответ: (3(1/3); 6)