Question

Rozwiąż układ równań:
a.
2(x+y)-3(x-y)=27
3(x+y)+(x-y)=-20


b.
(2x+y)-6(x+2y)=3
(x+2y)+2(2x+y)=6

c.
- =


d.
[tex] \frac{3x-y}{2} - \frac{1-y}{3} = 0
[tex] \frac{x-y}{2} + \frac{3x+y}{4} =5


+20pkt!!