Odpowiedzi

2009-12-10T16:08:10+01:00
A)3x = 12 /:3
x - y = 1

x=4

4-y=1
y=3

b)5y = 2 /:5
x + y = 2 2/5

y=2/5

x+2/5=2 2/5
x=2

c)4y-x =6
17y = 0

y=0

0-x=6
x=-6

2009-12-10T16:08:27+01:00
A) 3x=12 /:3
x-y=1

x=4
4-y=1 /-4
-y=-3 czyli y=3

b) 5y=2/:5
x+y=2 2/5

y=2/5
x+2/5=2 2/5 /-2/5
x=2

c)4y-x=6
17y=0
y=0
4*0-x=6
x=-6
2009-12-10T16:08:49+01:00
A)
x=12:3
x-y=1
x=4
4-y=1
x=4
-y=-3 /*(-1_
x=4
y=3

b)
y=2/5
x+y=2 2/5
y=2/5
x+ 2 2/5=2 2/5
y=2/5
x=0

c)
nie bardzo mi wychodzi =.=