{1/4х-у=-5                                                                                                                                   {1/2х-1/7у=3

{1/4х-у=-5 |*4                                                                                                           {1/2х-1/7у=3|*14 {x - 4y = -20 {7x - 2y = 42 {x=4y-20 {7x-2y=42 {x=4y-20 {28y - 140 - 2y = 42 {x=4y-20 {y=7 {x=8 (y=7 Отметь как лучшее плиз)))