Question

Решите пожалуйста систему уравнений....

Answer 1

$left { {{x(5x-9) =y} atop {5x-9=y}} right.$

x(5x-9) = 5x-9

x(5x-9)  - (5x-9) = 0

(5x - 9)(x - 1) = 0

5x - 9 = 0

5x = 9

x = 1,8

x - 1 = 0

x = 1

5x - 9 = y | x = 1,8

9 - 9 = y

y = 0

5x - 9 = y | x = 1

5 - 9 = y

y = -4

5x^2 - 9x = y | x = 1,8

y = 16.2 - 16.2

y = 0

5x^2 - 9x = y | x = 1

5 - 9 = y

y = -4

OTBET: x = 1.8, x = 1; y = 0, y = -4