Question

Помогите решить уравнения.

Answer 1

1) 4х - 6 - 4х - 5 = 21 - 9х
-11 = 21 - 9х
9х = 32
х = 32/9
2) 25у - 5у^2 = 2у^2 + 6у
2у^2 + 6у + 5у^2 - 25у = 0
7у^2 - 19у = 0
у(7у - 19) = 0
у1 = 0
7у - 19 = 0
7у = 19
у2 = 19/7