a){x=3-y б){y=1+x в){x2+y=14 {y-x=8 {x+y2=-1 {y2-x=39 г){x+y=4 {y+xy=6

Question

a){x=3-y б){y=1+x в){x2+y=14

{y-x=8

{x+y2=-1

{y2-x=39

г){x+y=4

{y+xy=6

Answer 1

а) у2-3-у-39=0

у2-у-42=0

Д=1+168=169

у1=1+13
          2   =7

у2=1-13

          2   = -6

1){y1=7                         2){y2=-6

   {x1= -4                            {x=3

 

ответ:(-4;7) (3;-6)


б) х+(1+х)2+1=0
х2+2х+2=0
д=4-8=-4

ответ:корней нет


в){x2+y=14

{y=8+x
х2+8+х-14=0

х2+х-6=0

д=1+24=25
х1= -1+5

           2    =2                                        1){x1=2           2){x2=-3
х2= -1-5                                                   {y1=10              {y2=-11
ответ:(2;10)    (-3;-11)

           2      =-3