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y - waga agrafki
x=4y
4x+9y=43,75
x=4y
4·4y+9y=43,75
x=4y
16y+9y=43,75
25y=43,75
y=1,75
x=4·1,75=7
y=1,75g - waga agrafki
x=7g - waga guzika
4·1,75g+9·7g=7g+63g=70g
Odp: 4 agrafki i 9 guzików ważą razem 70g.