Penjelasan dengan langkah-langkah:

spldv

metode substitusi

-

model matematikanya:

» 2x + 3y = 210.000 …(pers. 1)

» 4x + 2y = 220.000 …(pers. 2)

↓

pindah ruas, pers. 1

» 2x + 3y = 210.000

» 2x = 210.000 - 3y

» x = 105.000 - 3/2 y

↓

substitusikan ke pers. 2

» 4x + 2y = 220.000

» 4(105.000 - 3/2 y) + 2y = 220.000

» 420.000 - 6y + 2y = 220.000

» -4y = 220.000 - 420.000

» -4y = -200.000

» y = 50.000 {harga 1 celana}

↓

substitusikan ke pers. 1

» x = 105.000 - 3/2 × 50.000

» x = 105.000 - 75.000

» x = 30.000 {harga 1 baju}

HP = {30,000 , 50,000}

maka:

= 2b + 1c

= 2 × 30.000 + 1 × 50.000

= 60.000 + 50.000

= 110.000 ✓✓