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Bab Persamaan LinearMatematika SMP Kelas VIII
Terigu = a
Beras = b
10a + 5b = 70.000 → dikali 2 menjadi → 20a + 10b = 140.000
20a + 10b = 140.000
6a + 10b = 84.000
---------------------------- -
14a = 56.000
a = 4.000
10a + 5b = 70.000
10 . 4.000 + 5b = 70.000
5b = 70.000 - 40.000
b = 30.000 : 5
b = 6.000
8a + 20b = 8 . 4.000 + 20 . 6.000
= 32.000 + 120.000
= Rp 152.000,00
10x+5y=70000 |*2=20x+10y=140000 -
-14x= -56000
x=4000
6(4000)+10y=84000
24000+10y=84000
10y=84000-24000
10y=60000
y=6000
8(4000)+20(6000)=32000+120000
=152.000