Question 343272
Zero.
{{{graph(300,300,-10,10,-10,10,2,4,6,8)}}}
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One
{{{graph(300,300,-10,10,-10,10,2x,4x,-2x,-x)}}}
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Three 
{{{graph(300,300,-10,10,-10,10,x,x+4,x+6,4)}}}
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Four
{{{graph(300,300,-10,10,-10,10,x,x+6,4,8)}}}
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Five
{{{graph(300,300,-10,10,-10,10,x,2x+1,2,8)}}}
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Six
{{{graph(300,300,-10,10,-10,10,x,2x+1,-x+3,8)}}}