2x-xy+y=3 x+2xy-2y=4 (система)

Question

2x-xy+y=3

x+2xy-2y=4

(система)

Answer 1

                                                    Решение:

                                                                           

                                                                                                                                                                                                                                                                                                        

Смотри  вложение:

 

 

 

 

Answer 2

2x-xy+y=3

x+2xy-2y=4  (*2)

 

4x-2xy+2y=6  +

х+2ху-2у=4

 

5х=10

 х+2ху-2у=4

 

х=2

2+4у-2у=4

 

х=2

2у=2

 

х=2

 у=1