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1.15x = 1,30y + 30 000 * 1,20
x= 30 000 - y
1.15 *(30 000 - y) +1,30y = 36 000
x=...
34500 - 1.15y + 1,30y = 36 000
x=...
0,15y=1500
x=...
y=10 000
x=20 000
y=10 000
{x + y = 30000
{1.15x + 1.3y= 36000
x=30000-y
1.15(30000-y) + 1.3y=36000
34500-1.15y+1.3y=36000
0.15y=1500/:0.15
y=10000
x=30000-y=30000-10000=2000
Samochody zakupil za 10000 i 20000