1) {x^2+y^2 = - 21

x+y=-3

2) {x^2+4y^2=34

x+y=7

reshite sistemu uravneniy

Question

Алгебра

Христинья

2 февраля, 01:30

1) {x^2+y^2 = - 21

x+y=-3

2) {x^2+4y^2=34

x+y=7

reshite sistemu uravneniy

+5

Ответы (1)

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Маримьяна · Answer 1

{x^2+y^2=-21

x=-y-3

(-y-3) ^2+y^2=-21

- (y+3) ^2+y^2=-21

- (y^2-6y+9) + y^2=-21

-y^2+6y-9+y^2=-21

6Y=21+9

6y=30

x=5

{x^2+4y^2=34

x=7-y

(7-y) ^2+4y^2=34

49-14y+y^2+4y^2=34

5y^2-14y+15=0

D=16

x1=2.4

x2=1

1) {x^2+y^2 = - 21x+y=-32) {x^2+4y^2=34x+y=7reshite sistemu uravneniy

1) {x^2+y^2 = - 21

x+y=-3

2) {x^2+4y^2=34

x+y=7

reshite sistemu uravneniy