Odpowiedzi

2009-11-23T02:48:35+01:00
1. (3x-y)/x+2y=2|×(x+2y)
4(x-2)-3(y+5)=-6

3x-y=2x+4y
4x-8-3y-15=-6

x=5y
4*5y-3y=17

x=5y
17y=17

x=5y
y=1

x=5
y=1

2. 3(2x+3)-5(3y-2)=22
(x-3y)/4x-7y=-1 |×(4x-7y)

6x+9-15y+10=22
x-3y=-4x+7y

6x-15y=3
5x=10y

6x-15y=3
x=2y

6*2y-15y=3
x=2y

12y-15y=3
x=2y

-3y=3 |÷(-3)
x=2y

y=-1
x=-2