2x + y = 5.500
tentukan harga satu buku dan bolpoin?
ket : x = buku
y = bolpoin.
pake metode eliminasi sama subtitusi. TOLONG BANGET PLEASE
X + 3y = 12.500
X + 3y = 12500 | x 2 | 2x + 6y = 25000
2x + y = 5500 | x1 | 2x + y = 5500
2x+6y=25000
2x+y=5500
____________-
5y = 19500
y = 19500/5500
y = 3900
x + 3y =12500
x + 3 (3900) = 12500
x + 11700 = 12500
x = 12500 – 11700
x = 800