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2a - b = 175
Kurangkan kedua persamaan diatas, maka didapat
a = 150
Dengan metode subtitusi maka diperoleh b = 125
2X - Y = 175. Kali 1
2X - 2Y =50
2X - Y = 175 ----------->Y=125
2X -Y =175
2X-125=175
2X =300
X=150