Respostas

2013-06-11T21:34:52-03:00

PA(12 x y),,,,,,,,,, 2x=12+y
PG(x y 4),,,,,,,,,,, y² = 4x

y= 2x-12

(2x-12)² = 4x
4x²-48x+144 = 4x
4x²-52x+144 = 0
x²-13x+36 =0
(x-4)(x-9)=0

x=4.......y=-4 ( descartadas)
x=9.......y= 6 PA(12 9 6) PG(9 6 4) 


x=4 e y = 9

2 3 2