Odpowiedzi

2010-03-08T20:21:40+01:00
C) { 2 (2x-y)+3 (x+3y)= 42
{ 5 (x+3y)-8 (2x-y)= -32

4x-2y+3x+9y=42
5x+15y-16x+8y=-32

7x+7y=42
-11x+23y=-32

7y=42-7x /7
-11x+23y=-32

y=6-x
-11x+23(6-x)=-32

y=6-x
-11x+138-23x=-32 -138

y=6-x
-34x=-170 /(-34)

y=6-x
x=5

y=6-5=1
x=5