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manggis = y
3x + 2y = 57.500
x + 3y = 42.500
yang atas x1 yang bawah x3
3x + 2y = 57.500
3x + 9y = 127.500
-7y = -70.000
y = 10.000
substitusi
3x + 2y = 57.500
3x = 57.500 - 20.000
3x = 37.500
x = 12.500
aminah :
2x + 2y = 2 ( 12.500) + 2 (10.000) = 25.000 + 20.000 = 45.000
duku=x
manggis = y
3x+2y = 57500
x+3y = 42500 (kali 3 utk mengeliminasi)
3x+2y = 57500
3x+9y =127500
-7y = -70000
y = 10000
substitusi y= 10000 ke x+3y
x=42500-3y
x=42500- 3(10000)
x=12500
2 duku&2 manggis = 2x+2y =2(12500) + 2(10000) = 45.000