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Mathematics
Mathematics
Problem
Use algebraic methods to decide whether these relations are functions. Explain your answers. a.
y
=
x
2
−
9
y = x^2 - 9
y
=
x
2
−
9
b.
x
+
y
=
9
x + y = 9
x
+
y
=
9
c.
x
2
+
y
2
=
9
x^2 + y^2 = 9
x
2
+
y
2
=
9
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