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2x + y = 11.500 (x2) 4x + 2y = 23.000
------------------------- -
-x = - 4.500
x = 4.500
2x + y = 11.500
2.(4.500) + y = 11.500
9000 + y = 11500
y = 11500 - 9000
y = 2500
x + 3y
4500 + 3(2500)
4500 + 7500
12000
jadi jawabanya Rp.12.000.00