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20x+10y=20 000
x=1500-y
20(1500-y)+10y=20 000
x=1500-y
30 000-20y+10y=20 000
x=1500-y
10y=10 000
x=1500-y
y=1000
x=500
sprzedano 500 biletów po 20zł i 1000 biletów po 10zł
y - bilety 20 zł
10x+20y=20000
x+y+1500
x=1500-y
10x+20y=20000
10(1500-y)+20y=20000
15000-10y+20y=20000
10y=5000
y=500
x+y=1500
x+500=1500
x=1000