Question 1073851
{{{system(y-x=9,(x+3)(y+3)=120)}}}



-
{{{(x+3)(x+12)=120}}}

{{{x^2+15x+36-120=0}}}

{{{x^2+15x-84=0}}}
From here, factorization to solve may not work.
{{{84=2*42=3*28=4*21=6*14=7*12}}}


General quadratic equation solution is needed.
{{{x=(-15+sqrt(561))/2}}}, approximately 4.3427
and use this to find y.