a. Rp30.000
b. Rp20.000
c. Rp22.000
d. RP16.000
Bantu ya, soalnya besok try out. Terus materi blm selesai semua;) thanks before.
Ratna membeli 2 gunting dan 3 spidol, seharga Rp.18000, randy membeli 3 gunting dan 5 spidol seharga Rp.29000, Ady membeli 4 gunting dan 2 spidol, berapa uang yg harus adi bayar? E
Mis: gunting = x
spidol = y
2x+3y = 18000 | ×3
3x+5y = 29000 | ×2
—————————–
6x+9y = 54000
6x+10y = 58000 –
————————-
-y = -4000
y = 4000
2x+3y = 18000
2x+3.4000 = 18000
2x+12000 = 18000
2x = 18000-12000
2x = 6000
x = 6000:2
x = 3000
4x+2y = 4.3000+2.4000
4x+2y = 12000+8000
4x+2y = 20000
Jawaban: B
Misal
gunting =g
slidol=s
dik
2g+3s = 18000
3g+5s=29000
dit
4g+2s = ?
jawab
3s=18000-2g
s = 6000-2/3g
3g + 5s =29000
3g + 5(6000-2/3g)=29000
3g + 30000-10/3g=29000
………………………………..dikali 3
9g +90000-10g=87000
-g = -3000
g=3000
s=6000-2/3g
s=6000-2000
s=4000
4g+2s=12000+8000=20000