Question 60374
8x + 9y = 1
- 2x + 6y = 5

a = 8    b = 9  c = 1
d = - 2  e = 6  f = 5

D = ae - db = (8)(6) - (-2)(9) = 48 + 18 = 66
Dx = ce - fb = (1)(6) - (5)(9) = 6 - 45 = - 39
Dy = af - dc = (8)(5) - (-2)(1) = 40 + 2 = 42
x = Dx / D = -39 / 66 = -13 / 22
y = Dy / D = 42 / 66 = 11 / 33