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find an equation of the tangent line to the graph of y=xlnx at the point (1,0)
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\[y'=(1) \ln(x)+x \frac{1}{x}=\ln(x)+1\]
\[y'|_{x=1}=\ln(1)+1=0+1=1\]
\[y=x+b\]
we need to find b the y-intercept
we know a point on this line: (1,0)
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0=1+b=> -1=b=> b=-1
\[y=x-1\]
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