Question

Cepat ya
3pensil+6pulpen=15000
2pensil+3pulpen=8000
Berapa harga =2pensil+4pulpen
Tolong y

Answer 1

Pensil = x
pulpen = y

3x + 6y = 15000
2x + 3y = 8000
=
6x + 12y = 30000
6x + 9y = 24000
_______________-
3y = 6000
y = 6000 : 3
y = 2000

maka 2x + 3y = 8000
2x + 3(2000) = 8000
2x + 6000 = 8000
2x = 8000 - 6000
2x = 2000
x = 2000 : 2
x = 1000

maka 2x + 4y = 2(1000) + 4(2000)
= 2000 + 8000
= 10.000