Rozwiaz uklad rownan:
x+y=15
12y+6x=120
x+y=15 /*(-6)
6x+12y=120
-6x-6y=-90
_____________
6y=30 /:6
y=5
x+y=15 /*(-12)
-12x-12y=-180
-6x=-60 /:(-6)
x=10
x=15-y
12y+6(15-y)=120
12y+90-6y=120
6y=120-90
6y=30
6y=30/:6
x=15-5
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x+y=15
12y+6x=120
x+y=15 /*(-6)
6x+12y=120
-6x-6y=-90
6x+12y=120
_____________
6y=30 /:6
y=5
x+y=15 /*(-12)
6x+12y=120
-12x-12y=-180
6x+12y=120
_____________
-6x=-60 /:(-6)
x=10
x=15-y
12y+6x=120
x=15-y
12y+6(15-y)=120
x=15-y
12y+90-6y=120
x=15-y
6y=120-90
x=15-y
6y=30
x=15-y
6y=30/:6
x=15-y
y=5
x=15-5
y=5
x=10
y=5