If xy ? 0 and x^2 y^2 – xy = 6, which of the

Rob

Use u-substitution
xy(xy-1)=6
u=xy
u(u-1)=6
u^2-u-6=0
(u-3)(u+2)=0
u=3 or -2
xy=3 or -2
y=3/x or -2/x

May 17, 2017 • Comment

Jeffrey Braganza

x^2 y^2 – xy = 6
x^2 y^2 – xy - 6 = 0
Solving above eq. we get:
(xy - 3)*(xy+2) = 0
xy = 3 & xy = -2
Y=3/x & y = -2/x

Ans: II & III only

Jan 2, 2016 • Comment