Odpowiedzi

2010-01-14T16:11:19+01:00
1. a)x=5-2y
-y+2=3x


-y+2=3(5-2y)
y=13/5
x=-1/5
b)y=2x-5
2y+4x=1


2(2x-5)+4x=1
x=11/8
y=-2 1/4
2. a)2x+3y=1
-2x+4y=2


y=3/7
x=1 6/7
b)4x-y=7
-4x+6y=-4

y=3/5
x=7 3/20
c)36x+42y=18
56x-42y=-28

x=5/16