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pensil = y
x + y = 5.500 ⇒ x2 ⇒ 2x + 2y = 11.000
2x + 3x = 12.500 ⇒ x1 ⇒ 2x + 3x = 12.500 -
-x = -1500
x = 1500
x + y = 5.500
1.500 + y = 5.500
y = 4.000
C. 4x = 6.000
2y = 8.000