Question 987813
{{{system(2x+2y=20,x^2+y^2=68)}}}


{{{system(x+y=10,x^2+y^2=68)}}}


{{{x^2+(10-x)^2=68}}}


{{{x^2+100-20x+x^2=68}}}


{{{2x^2-20x+32=0}}}


{{{x^2-10x+16=0}}}
You finish from here.