mam takie równanie :
{x+y=29 /*2
{2x+3y=70
{2x+2y=58
{2x+3y=70
y =12 a x 17 dlaczego jak to przemnozyc przedzielic by taki wynik wyszedł
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1
{x+y=29 /*(-2)
{2x+3y=70
-2x-2y=-58
2x+3y=70
-------------------
y=12
x+12=29
x=29-12
x=17
y=12
x=17
2.
{2x+2y=58/(-1)
{2x+3y=70
-2x-2y=-58
2x+3y=70
-------------
y=12
2x+3*12=70
2x=70-36
2x=34/2
x=17
y=12
x=17
2x+2y=58 /:2
2x+3y=70
x+y=29
2x+3y=70
x=29-y
2(29-y) +3y=70
x=29-y
58 - 2y+3y=70
x=29-y
y=12
x=29-12
y=12
x=17
y=12