II.- Sistemas de ecu. 2º grado con dos incógnitas

1.2431.244
\large 5x+7y=61
           \large xy=\: \: 8
\large x-y=\: \: 2
       \large xy=48
1.2451.246
\large 6x-5y=14
           \large xy=72
\large x+xy+y=11
                  \large xy=\: \: 6
1.2471.248
    \large xy+2y=4
    \large 3x-\: \: y=5
\large 5xy-3x=84
 \large 2x\: \: +7y=35
1.249
\large x(1+5y+\frac{y}{x})=31
                        \large xy=\: \: 5
1.250
\large x-xy+y=\frac{11}{6}
                     \large 3xy=\: \: 7      
1.251
\large x+xy-y=16
                        \large xy=12      
1.252
\large x-y(3x+1)=-\frac{1}{3}
                          \large 5xy=\: \: 1      
1.253
\large x+\sqrt{xy}+y=14
                            \large xy=16      
1.254
\large x-\sqrt{xy}-y=10
                            \large xy=36      
1.255
\large x^{2}+y^{2}+3y+y=20
                             \large x-y=\: \: 2      
1.256
\large 2x^{2}+3y^{2}-x-5y=26
                               \large 3x-2y=10      
1.257
\large x^{2}-xy=-52
      \large \frac{x-1}{y-1}=\frac{3}{4}      
1.258
\large (x+2)+(y+3)=11
          \large (x+2)\: \: (y+3)=24      
1.259
\large (x-4)+(y-7)=3
          \large (x-4)\: \: (y-7)=2      
1.260
\large (x+3)(y+4)=48
                   \large x+y=\: \: 9
1.261
\large (x+2)(y-7)=\: \: 4
                   \large x+y=14
1.262
\large x^{2}+y^{2}+x-5y=24
                        \large x+y=\: \: 7
1.263
\large 3x^{}+xy+2y^{2}+3x+2y=39
                                    \large 2x+3y=\: \: 3
1.264
\large (x+y)^{2}-(x-y)^{2}=40
               \large x+3xy-y=21
1.265
\large (x+y)^{2}-(x-y)^{2}=28
                  \large x-xy+y=\: \: 1
1.266
 \large (x+1)^{2}+(y+1)^{2}=52
\large 2(x+4)+3(y-2)=23
1.267
\large (x+2)^{2}+(y+3)^{2}=32
                        \large 5x+4y=14

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