Solve the equations: xy = 6, y = x + 6

Solve the equations: xy = 6, y = x + 6

xy=6, ①
y=x+6 ②
We can get the following results
x(x+6)=6
x²+6x=6
x²+6x+9=15
(x+3)²=15
x+3=±√15
x=-3±√15
y=3±√15