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penggaris : y
3x+2y=9000
x-y=500
x+3y?
jawab
3x+2y=9000 x1
x-y=500 x2
3x+2y=9000
2x-2y=1000 +
5x=10000
x= 10000/5 = 2000
satu buku = 2000
masukan ke x-y=500
x-y=500
2000-y=500
y=2500
harga 1 penggaris = 2500
x+3y=?
2000+3(2500)=
2000+7500= 9500