Odpowiedzi

2010-03-08T19:09:23+01:00
{ 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 -> 7x=42-7y |:7 -> x=6-y
{23y-11x=-32

23y-11(6-y)=-32
23y-66+11y=-32
34y=-32+66
34y=34 |:34
y=1
x=6-1
x=5
2010-03-08T19:15:28+01:00
4x-2y+3x+9y=42
5x+15y-16x+8=-32
7x+7y=42 /:7
-11x+15y=-47
x+y=6
-11x+15y=-47
y=6-x
-11x+15y=-47
y=6-x
-11x+15(6-x)=-47
y=6-x
-11x+90-15x=-47
y=6-x
-26x=-137
y=6-x
x=5 7/26
y=1 7/26