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2010-01-26T18:36:57+01:00
4(2x+3)-2(4y-1)=30
8x+12-8y-2=30
8x+(-8y)=30-12+2
0xy=20
xy=20

5x+1-y-3=3
5x-y=3+3-1
5xy=5/:5
xy=1
1 5 1
2010-01-26T18:42:31+01:00
4 ( 2x-3)-2(4y-1)= 30
5x+1-y-3 = 34

8x-12-8y+2=30
5x-y=34+2

8x-8y=30+10
5x-y=35/ (-8)

8x-8y=40
- 40+ 8y=- 280

-32x=-240
x = 7,5

x=7,5
5*7,5 - y = 35

x=7,5
y=2,5
2 5 2