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2c + 3k = 330.000 | x3 |
3c + 4k = 465.000 | x2 |
jadi ..
6c + 9k = 990.000
6c + 8k = 930.000
----------------------------- -
k = 60.000
2c + 3k = 330.000
2c + 180.000 = 330.000
2c = 330.000 - 180.000
2c = 150.000
c = 75.000
harga 2c + k ?
2(75.000) + 60.000
150.000 + 60.000 = 210.000
2.
masukin ke akar semua..
kali sekawannya deh...
kemeja = y
maka
2x + 3y = 330.000 (x3) = 6x + 9y = 990.000
3x + 4y = 465.000 (x2) = 6x + 8y = 930.000 -
y = 60.000
2x + 3y = 330.000
2x + 3(60.000) = 330.000
2x + 180.000 = 330.000
2x = 150.000 ⇒ x = 75.000
maka harga 2 celana dan 1 kemeja = 2x + y = 2(75.000) + 60.000 = 210.000
(B)