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Pers.1: 12x+8y=44
Pers.2: 9x+16y=58
Pers.1 dikali 2 : 24x+16y=88 maka 16y=88-24x
Substitusi ke pers.2 :
9x+88-24x=58
-15x=-30
X=2
Substitusi nilai x ke pers.1: 12(2)+8y=44
8y=44-24
8y=20
Y=20/8= 2,5
Maka selisih berat 2,5-2=0,5gram