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baju = x
kaos = y
Model matematikanya:
2x + y = 170.000
x + 3y = 185.000
Eliminasi x
2x + y = 170.000
2x + 6y = 370.000
----------------------------- -
-5y = -200.000
y = -200.000/-5
y = 40.000
Substitusikan
2x + y = 170.000
2x + 40.000 = 170.000
2x = 170.000 - 40.000
2x = 130.000
x = 130.000/2
x = 65.000
3x + 2y = 3(65.000) + 2(40.000) = 195.000 + 80.000 = Rp. 275.000 (A)
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Mapel : Matematika
Kelas : 8
Materi : Sistem persamaan linear dua variabel
Kata kunci : harga baju dan kaos
Kode soal : 2
Kode kategorisasi : 8. 2. 5