Bantu soal nomor 15 dong,makasih.

3y = xy(2 - x) + x(x - 6)
3y = 2xy - yx² + x² - 6x
x² - yx² + 2xy - 6x - 3y = 0
(1-y)x² + (2y-6)x - 3y = 0
syarat real D ≥ 0
b² - 4ac ≥ 0
(2y-6)² - 4(1-y)(-3y) ≥ 0
4y² - 24y + 36 + 12y - 12y² ≥ 0
-8y² - 12y + 36 ≥ 0
----------------------- ÷ -4
2y² + 3y - 9 ≤ 0
(2y - 3)(y + 3) ≤ 0
-3 ≤ y ≤ 3/2