Oblicz układ równań(dokończ) {x+y=13 {10*y+x=10x+y+27 x+y=13 10y+x-10x-y=27 -9x+9y=27
{x+y=13
{10*y+x=10x+y+27
x+y=13
10y+x-10x-y=27
x = 13 - y
-9x+9y=27 /:9
-x + y = 3
-(13-y) + y = 3
-13 + y + y = 3
2y = 16 /:2
y = 8
x = 13 - 8
x = 5
y=8
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{x+y=13
{10*y+x=10x+y+27
x+y=13
10y+x-10x-y=27
x = 13 - y
-9x+9y=27 /:9
x = 13 - y
-x + y = 3
-(13-y) + y = 3
-13 + y + y = 3
2y = 16 /:2
y = 8
x = 13 - 8
x = 5
x = 5
y=8