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4x+y=12
y - ilość czwórek
x + y = 12
5x + 4y / 12 = 4,75 /*12
x = 12 - y
5x + 4y = 57
5(12 - y) + 4y = 57
60 - 5y + 4y = 57
-5y + 4y = 57 - 60
-y = - 3
y = 3
x = 12 - 3
x = 9
Odp: Na świadectwie Zuzanna ma 9 piątek.