Odpowiedzi

2010-02-16T16:49:27+01:00
{7x-3y=10
{4x+y=3 /*3

{7x-3y=10
{12x+3y=9
+________
19x=19
x=1

7-3y=10
-3y=3
y= -1
2010-02-16T16:50:19+01:00
{7x-3y=10
{4x+y=3 /*3

{7x-3y=10
+{12x+3y=9

19x=19 /:19
x=1

4x+y=3
4*1+y=3
y=3-4
y=-1

x=1
y=-1

2010-02-16T22:41:27+01:00
7x-3y=10
4x+y=3|*3

7x-3y=10
12x+3y=9
19x=19
x=1

7*1-3y=10
-3y=10-7
-3y=3
y=-1