Which ONE of the following is NOT a power function:
y
=
1
x
\displaystyle {y}=\frac{{1}}{{x}}
y
=
x
1
y
=
x
\displaystyle {y}=\sqrt{{{x}}}
y
=
x
y
=
x
2
+
1
\displaystyle {y}={x}^{{2}}+{1}
y
=
x
2
+
1
y
=
3
x
2
\displaystyle {y}={3}{x}^{{2}}
y
=
3
x
2
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