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2014-06-02T17:01:15-03:00

A⇒     xy=14      sistema    isola x=14/y
P⇒ 2x+2y=18

subs/   2(14/y) +2y=18                subs/   p/y=7                              p/ y=2

               28/y+2y=18                                x=14/7 = 2                        x=14/2=7

mmc=y        28+2y²=18y

                     2y²-18y+28=0  (:2)

                       y²-9y+14=0      

Δ=81-56=25             y=(9+5)/2                          R =  AS medidas são  7m e 2m

                                y=14/2 = 7

                    ou      y=(9-5)/2

                               y=4/2 = 2

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