Как решить систему ? [5x-y=1 [x+3y=5
5х - y = 1 5x - 1 = y x + 3( 5x - 1 ) = 5 x + 15x - 3 = 5 16x = 8 x = 0,5 y = 2,5 - 1 = 1,5 Ответ ( 0,5 ; 1,5 )
[5x-y=1, [5x-y=1, [5(5-3y)-y=1, [25-15y-y=1; [24=16y, [y=1,5, [y=1,5, [x+3y=5; [x=5-3y; [x=5-3y; [x=5-3y; [x=5-3y; [x=5-3y; x=0,5.