Question

X + y + 1 = 0
x^2 + 6xy + 9y^2 = 9
tentukan HP nya

Answer 1

X = -y - 1
x² + 6xy + 9y² = 9
Setelah itu, kita stubsitusikan
(-y - 1)² + 6y(-y - 1) + 9y² - 9 = 0
y² + 2y + 1 - 6y² - 6y + 9y² - 9 = 0
4y² - 4y - 8 = 0
y² - y - 2 = 0
(y + 1)(y - 2) = 0
y = -1,2
Jika y = 2, maka x = -3
Jika y = -1, maka x = 0