rozwiąż układ :
x+y=30
0,5x+0,25y=30
0,5x+0,25y=30 | *2
x+0,5y=60
x=60-0,5y
60-0,5y+y=30
0,5y=-30
x=60-0,5
y=-60
x=60-0,5*(-60)
x=60-(-30)
x= 60+30
x=90
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x+y=30
0,5x+0,25y=30 | *2
x+y=30
x+0,5y=60
x+y=30
x=60-0,5y
60-0,5y+y=30
x=60-0,5y
0,5y=-30
x=60-0,5
y=-60
x=60-0,5*(-60)
y=-60
x=60-(-30)
y=-60
x= 60+30
y=-60
x=90