Odpowiedzi

2010-01-31T11:44:34+01:00
A)
x+2y=9
4x-2y=-4
___________
5x = 5 | : 5
x = 1

x=1
1 + 2y = 9

x=1
2y = 9-1

x=1
2y = 8 | : 2

x=1
y=4

b)
-2x-y=6
2x-5y=6
___________
-6y = 12 | : (-6)
-y= -2

-y=-2 | : (-1)
2x-y=6

y=2
2x-2=6

y=2
2x=6+2

y=2
2x=8 | : 2

y=2
x=4

reszte napisze ci na pw