Question 358643
{{{drawing(300,300,-2,6,-2,1,circle(1,-1/4,0.2),circle(2,-1/2,0.2),circle(3,-3/4,0.2),graph(300,300,-2,6,-2,1,0))}}}
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Now that you see the points, you can easily answer your question.
{{{y(4)=-1}}}

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{{{drawing(300,300,-2,6,-2,1,circle(1,-1/4,0.2),circle(2,-1/2,0.2),circle(4,-1,0.2),circle(3,-3/4,0.2),graph(300,300,-2,6,-2,1,-x/4))}}}