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2x - x + 25 = 175
x = 150
Bilangan besar = 150
Bilangan kecil = 150 - 25 = 125
Dik : X - Y = 25
2X - Y = 175
Dit : nilai X dan Y ??
Jawab :
2x - y = 175 .... persamaan 1
x - y = 25 ...... persamaan 2
di eliminasi (-)
x = 150
masukkan ke pers 2
x - y = 25
150 - y = 25
y = 125