Question

Harga 3 kemeja dan 2 celana adlh Rp . 300.000,00 sdangkan 1 kemeja dan 4 celana harus di bayar Rp. 400.000,00 . Harga sebuah kemeja adlh ....
maaf tlng pke cara'a ya
(thanks)

Answer 1

Kemeja = x
celana = y

3x+2y = 300.000 x2 6x + 4y = 600.000
x + 4y = 400.000 x1 x + 4y = 400.000
5x = 200.000
x = 40.000

substitusikan,
x + 4y = 400.000
(40.000) + 4y = 400.000
4y = 360.000
y = 90.000

x + 4(90.000) = 400.000
x + 360.000 = 400.000
x = 400.000 - 360.000
x = 40.000

Answer 2

3k + 2c = 300.000 |4| 12k + 8c = 1.200.000

k+4c = 400.000     |2|   2k + 8c =    800.000 -                                   

                                   10k + 0 =     400.000                                              

                                       k =     \frac{400.000 =}{10} 40.000

jawabannya: 1 kemeja = 40.000