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buku = y
jawab:
- Nilai y :
<=> 2x + 4y = 11.000 | ×3
6x + 2y = 13.000 | ×1
<=> 6x + 12y = 33.000
6x + 2y = 13.000
______________ _
10y = 10.000
y = 1.000
- Subsitusi :
2x + 4y = 11.000
<=> 2x + 4(1.000) = 11.000
<=> 2x + 4.000 = 11.000
<=> 2x = 11.000 - 4.000
<=> 2x = 7.000
<=> x = 3.500
maka harga 2 pensil dan 3 buku :
<=> 2x + 3y
<=> 2(3.500) + 3(1.000)
<=> 7.000 + 3.000 = 10.000
SEMOGA MEMBANTU ^_^