Question 1114872
{{{system(2x+y=80,xy=750)}}}


{{{x(80-2x)=750}}}

{{{-2x^2+80x-750=0}}}

or, {{{x(40-x)=375}}}

{{{-x^2+40x-375=0}}}

{{{x^2-40x+375=0}}}

{{{(x-15)(x-25)=0}}}


If x=15 then y=50.
If x=25 then y=30.