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Functions
easy
0:00.0
Which of these is NOT a function?
A
y
=
x
y = x
y
=
x
B
y
=
x
2
y = x^2
y
=
x
2
C
x
=
5
x = 5
x
=
5
D
y
=
∣
x
∣
y = |x|
y
=
∣
x
∣
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