Odpowiedzi

2009-03-31T19:41:41+02:00
A)2x+5y=7
3x-5y=3
-----------
5x=10
x=2
4-5y=7
-5y=3
y=-3/5
y=-0.6

B)x+y=2
x-y=0
---------
2x=2
x=2
2-y=0
y=2


C)x+2y=9
-x-3y=16
-----------
-y=25
y=-25
x=9+50
x=59
2009-03-31T19:42:31+02:00
A
8x=10/÷8
x=10/8=1¼
b
x=4
c
-y=25/÷(-1)
y--25
2009-03-31T19:43:58+02:00
A) x=2
x=3/5

b)x=1
y=1

c)x=59
y=-25