100x+10y-ilość pieniędzy jaką ma Marek
x+y = 9
100y+10x = 100x+10y+90
x=9-y
100y+10(9-y)=100(9-y)+10y+90
100y+90-10y=900-100y+10y+90
100y-10y+100y-10y=-90+900+90
180y=900/180
y=5
x=9-5
x=4
100x+10y=100*4+10*5=400+50=450
Marek ma 450 złotych.
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100x+10y-ilość pieniędzy jaką ma Marek
x+y = 9
100y+10x = 100x+10y+90
x=9-y
100y+10(9-y)=100(9-y)+10y+90
x=9-y
100y+90-10y=900-100y+10y+90
x=9-y
100y-10y+100y-10y=-90+900+90
x=9-y
180y=900/180
x=9-y
y=5
x=9-5
y=5
x=4
y=5
100x+10y=100*4+10*5=400+50=450
Marek ma 450 złotych.