Odpowiedzi

2010-01-07T19:07:26+01:00
X+y=27
2y+1/2x(jedna druga)=24 /* (-2)

x+y=27
- x - 4y = - 48

-3y = - 21 / : (-3)
y = 7

x +7 =27 / - 7
x = 20


x= 20
y= 7

2010-01-07T19:13:06+01:00
x+y=27 / *(-2)
2y+1/2x=24

-2x-2y=-54
+ 2y+1/2x=24
---------------------------
-1 1/2 x = - 30 / : -1 1/2(minus jeden i jedna druga:)
x=20


x=20
x+y=27 / -20

x=20
20+y= 27 / -20

x=20
y= 7

2010-01-07T19:13:30+01:00
X+y=27
2y+½x=24
x+y=27 /razy(-2)
2y+½x=24
-2x-2y=-54
2y+½x=24
+------------
-1½x=-30/÷(-1½)
x=20
20+y=27
x=20
y=27-20
x=20
y=7