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Verified answer
Mapel : MatematikaBab : Sistem Persamaan Linear Dua Variabel
Diketahui :
- Dompet = a
- Tas = b
- 2a + 3b = 350.000
- 3a + 2b = 300.000
Ditanya :
- Nilai a + b = .....?
Penyelesaian :
- Nilai a :
(2a + 3b = 350.000) × 2
(3a + 2b = 300.000) × 3
4a + 6b = 700.000
9a + 6b = 900.000
—————————— —
- 5a = - 200.000
a = - 200.000/- 5
a = 40.000
- Nilai b :
3a + 2b = 300.000
3(40.000) + 2b = 300.000
120.000 + 2b = 300.000
2b = 300.000 - 120.000
2b = 180.000
b = 180.000/2
b = 90.000
- Nilai a + b :
a + b
= 40.000 + 90.000
= 130.000
Jawaban : C. 130.000
Maaf Kalau Salah
Verified answer
Dompet : xtas : y
2x + 3y = 350 000 => x2
3x + 2y = 300 000 => x3
= 4x + 6y = 700 000
9x + 6y = 900 000 -
---------------------------------
-5x = - 200 000
x = -200 000 : - 5
x = 40 000
Harga satu dompet = 40 000
2x + 3y = 350 000
2 (40 000) + 3y = 350 000
80 000 + 3y = 350 000
3y = 350 000 - 80 000
3y = 270 000
y = 270 000 : 3
y = 90 000
Harga satu tas = 90 000
satu tas + satu dompet = 90 000 + 40 000
total harga = 130 000
Jawaban = c
maaf kalo kepanjangan atau salah