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Jambu = x
Mangga = y
Maka :
8x + 12y = 4000 |x2| 16x + 24y = 8000
16x + 8y = 5600 |x1| 16x + 8y = 5600
-------------------------------------------------------------- -
16y = 2400
y = 150 (Mangga)
8x + 12y = 4000
8x + 12(150) = 4000
8x + 1800 = 4000
8x = 4000 -1800
8x = 2200
x = 275 (Jambu)
Jadi harga satu Mangga adalah Rp 150 dan harga satu Jambu adalah Rp 275
8jambu + 12 mangga = 4000
16jambu+ 8 mangga =5600
disubstitusi
8j+12m = 4000
16j+8m=5600
samakan j nya
16j + 24m=8000
-
16j + 8m = 5600
=16m=2400
=m=2400:16
=m=150
8j + 12m = 4000
8j +12x 150=4000
8j +1800=4000
8j = 4000-1800
j=2200:8=275
jadi harga jambu=150 dan mangga=275