Question 345337
{{{x^2-4xy+4y^2=36}}}
{{{(x-2y)^2=36}}}
{{{x-2y=0 +- 6}}}
{{{highlight(y=(x +- 6)/2)}}}
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{{{graph(300,300,-10,10,-10,10,(x+6)/2,(x-6)/2)}}}