roziaz uklad rownan 2x-3y=6 x+2y=7

2x-3y=6 x+2y=7 2x-3y=6 -2x-4y=-14 -7y=-8 y=8/7 2x-3*8/7=6 2x=66/7 x=33/7 x=4 5/7 y=8/7

2x-3y=6 / *2 x+2y=7 / * 3 4x-6y=12 3x+6y=21 + ------------------ 7x = 33 / 7 x = 4,71 x+2y=7 x=4,71 4.71+2y=7 x=4,71 2y=7-4,71 x=4,71 2y=2,29 /2 x=4,71 y=1,145 x=4,71 ( UWAGA ! to jest w przybliżeniu bo 33/7=4,714285714286 )

2x-3y=6 x+2y=7 / * (-2) 2x-3y = 6 -2x -4y = -14 -7y = -8 /:-7 y=8/7 x+ 2 * 8/7 = 7 y=8/7 x= 7 -16/7 y= 8/7 x=7 - 2 i 2/7 = 4 i 5/7 y = 8/7