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sandal=b
2a+3b=175000
3a+4b=225000
tentukan: a+2b=?
jwb : 3(2a+3b=175000)
2(3a+4b=225000)
= 6a+9b=525000
6a+8b=450000
_____________-(dikurang)
b=75000
substitusi b=75000 ke 6a+8b=450000
6a+8(75000)=450000
6a=450000-600000
a=(-150000)/6
a=(-25000)
a+2b=(-25000)+2(75000)
=(-25000)+150000
=125000
maaf klo slh:v