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0,75x - 0,125 = 2 ... ( 2 )
( 1 ) * 100
50x + 25y = 300 ... ( 3 )
( 2 ) * 1000
750x - 125y = 2000 ... ( 4 )
Sederhanakan agar menjadi kecil
( 3 ) : 25
2x + y = 12 ... ( 5 )
( 4 ) : 125
6x - y = 16 ... ( 6 )
( 5 ) + ( 6 )
8x = 28
x = 28/8 = 7/2
Masukkan y ke salah satu persamaan, disini saya mencoba ke ( 6 )
21 - y = 16
- y = - 5
y = 5