0,5x - 0,25y = 4 0,25x + y = 7 / * (-2) 0,5x - 0,25y = 4 -0,5x - 2y = -14 0,5x-0,25y-0,5x-2y = 4-14 -2,25y = -10 / :-2,25 y=4,44 y=4,44 0,25x - 4,44 = 7 0,25x = 7-4,44 0,25x=2,56 / :0,25 x=10,24
0,5x-0,25y=4 0,25x+y=7 y=7-1/4x 1/2x-1/4(7-1/4x)=7 1/2x-7/4+1/16x=7 8/16x+1/16x=7+7/4 9/16x=28/4+7/4 9/16x=35/4 x=35/4:9/16 x=35/4*16/9 x=140/9 y=7-1/4*140/9=7-35/9=63/9-35/9=28/9 Spr. 1/4*140/9+28/9=35/9+28/9=7 pozdrawiam:)
0,5x - 0,25y = 4 0,25x + y = 7 1/2x - 1/4y = 4 y = 7 - 1/4x 1/2x - 1/4(7-1/4x) = 4 y = 7 - 1/4x 1/2x - 7/4 + 1/8x = 4 y = 7 - 1/4x 5/8x = 23/4 /*8 y = 7 - 1/4x 5x = 184/4 / :5 y = 7-1/4x x = 184/20 y = 7 - 1/4x x = 184/20 y = 7 - 1/4 * 184/20 x = 184/20 y = 7- 46/20 x = 9 i 1/5 y = 4 i 7/10
