Odpowiedzi

2010-03-29T17:53:06+02:00
X+y=15
17x+20y=210

x= 15-y

17(15-y) + 20y= 210
255 - 17y +20y = 210
3y= - 45 |:3
y= -15


x= 15-y
x= 15 - (-15)
x=30
2010-03-29T17:57:41+02:00
X+y=15/-y
17x+20y=210

x=15-y
17*(15-y)+20y=210

x=15-y
255-17y+20y=210/-255

x=15-y
3y=-45/:3

x=15-y
y=-15

x=15-(-15)
y=-15

x=15+15
y=-15

x=30
y=-15
2010-03-29T17:58:03+02:00
X+y=15/-y
17x+20y=210

x=15-y
17(15-y) + 20y=210

x=15-y
255-17y + 20y = 210

x=15-y
3y=-45/:3

x=15-y
y=-15

x=15-(-15)
y=-15

x=30
y=-15