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y - ilość wagonów 15to tonowych
x+y=59
10x + 15y = 800/:5
x=59-y
2x + 3y = 160
/podstawiamy x dodrugiego rownania
x=59-y
2(59-y) +3y = 160
x=59-y
118 -2y+3y = 160
x=59-y
y=42
y=42
x=17
Odpowiedz:
Pociag przewozi towar w 42 15to tonowych wagonach i 17tu 10cio tonowych wagonach.