Question 839284
xy = 2
x = y + 4


Substitute the second equation into the first equation.


(y + 4)(y) = 2
y^2 + 4y - 2 = 0


y = (-4 +- sqrt(16 - 4(1)(-2))/(2)
= (-4 +- sqrt(24))/(2)
= (-4 +- 2sqrt(6))/(2)
= -2 +- sqrt(6)