Question 1206183
dimension x and y


{{{system(xy=90,x+y=38/2=19)}}}


Factors of 90?
{{{3*30}}}
{{{5*18}}}
{{{6*15}}}
{{{highlight_green(9*10)}}}


{{{x(19-x)=90}}}
-
{{{19x-x^2=90}}}
{{{x^2-19x+90=0}}}

{{{x=(19+- sqrt(19^2-4*90))/2}}}

{{{x=(19+- sqrt(1))/2}}}

{{{x=(19+- 1)/2}}}

{{{system(highlight(x=9),and,highlight(y=10))}}}