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Umpamakan
x = apel
y = mangga
2x + y = 4000
3x + 4y = 8500
Disamakan y-nya.
8x + 4y = 16000
3x + 4y = 8500
______________-
5x = 7500
x = 7500/5
x = 1kg apel = c.1500
Soal-soal selanjutnya menggunakan metode yang sama :)
2a+m=4000 | ×4 | 8a+4m=16000
3a+4m=8500 | ×1 | 3a+4m=8500
____________________________________-
5a=7500
a=7500/5
a=1500 (D)
nomor 21
2a+3j=57000 | ×3 | 6a+9j=171000
3a+5j=90000 | ×2 | 6a+10j=180000
____________________________________-
-j=-9000
j=9000
2a+3j=57000
2a+3.9000=57000
2a+27000=57000
2a=57000-27000
2a=30000
a=30000/2
a=15000
sisa=100000-(a+j)
sisa=100000-(15000+9000)
sisa=100000-24000
sisa=76000 (D)
nomor 22
2b+e=14000 | ×2 | 4b+2e=28000
b+2e=13000 | ×1 | b+2e=13000
____________________________________-
3b=15000
b=15000/3
b=5000
2b+e=14000
2.5000+e=14000
10000+e=14000
e=14000-10000
e=4000
bayar=8b+x
60000=8.5000+x
60000=40000+x
60000-40000=x
20000=x
banyak es campur
=x/4000
=20000/4000
=5