Question 1143278
{{{system(x=0.4y,y=x^2)}}}


{{{y=x/0.4}}}

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{{{x/0.4=x^2}}}

{{{x^2-x/0.4=0}}}

{{{x^2-x/(4/10)=0}}}


{{{x^2-(10/4)x=0}}}


{{{x^2-(5/2)x=0}}}

{{{x(x-5/2)=0}}}

{{{highlight(x=5/2)}}}