Question

Алгебра помогитеее строчно

Answer 1

Ответ:

1)

{x = 13-2y

{(13-2y)*y = 15

13y - 2y^2 - 15 = 0 / :(-1)

2y^2 - 13y + 15 = 0

D = 169 - 120 = 49

√D = 7

y1= (13 - 7)/4 = 6/4 = 3/2 = 1,5

y2= (13+7)/4 = 20/4 = 5

x1= 13 - 2y1 = 13 - 3 = 10

x2= 13 - 2y2 = 13 - 10 = 3

2)

{x = 2+2y

{(2+2y)*y=12

2y^2 + 2y - 12 = 0

D = 4 + 96 = 100

√D = 10

y1= (-2-10)/4 = -12/4 = -3

y2= (-2+10)/4 = 8/4 = 2

x1= 2 + 2y1 = 2 + 2(-3) = 2 - 6 = -4

x2= 2+2y2 = 2 + 2*2 = 6

Answer 2

Ответ:

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Объяснение:

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