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pena = y
2x + 4y = 10.000 ×3 6x + 12y = 30.000
5x + 3y = 18.000 ×4 20x+ 12 y = 72.000
________________ -
-14x = -42.000
x = 42.000/14 = 3000
2x + 4y = 10.000
2 (3.000) + 4y = 10.000
6.000 + 4y = 10.000
4y = 10.000 - 6.000
4y = 4.000
y = 4.000/4 = 1000
kalau 10 buku dan 10 pena =
10x + 10y=
10 (3.000) + 10 (1000) =
30.000 + 10.000 = Rp 40.000
kasih yang terbaik ya :)