Question

* = pangkat 2
3x* - 2y* = 57
2x* - 3y* = 23

x=.....?
y=.....?

Answer 1

3x² - 2y² = 57 (kali 2)
2x² - 3y²= 23  (kali 3)
menjadi:
6x² - 4y² = 114
6x² - 9y² = 69
____________ -
5y² = 45
  y² = 9
  y = 3 atau y = - 3
3x² - 2(9) = 57
3x² = 75
x² = 25
x = 5 atau x = - 5
HP: {(5,3),(5,-3),(-5,3),(-5,-3)}