Question 846878
{{{drawing(300,300,-10,10,-10,10,grid(1),graph(300,300,-10,10,-10,10,0.5x+6))}}}
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Any equation of the form {{{x=a}}} where {{{a}}} is any non-zero number would work.
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As an example, {{{x=4}}}
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{{{drawing(300,300,-10,10,-10,10,green(line(4,-10,4,10)),grid(1),graph(300,300,-10,10,-10,10,0.5x+6))}}}