Match each graph with its equation.
-
a
b
c
d
e
f
(
x
,
y
)
=
1
1
+
x
2
+
y
2
\displaystyle {f{{\left({x},{y}\right)}}}=\frac{{1}}{{{1}+{x}^{{2}}+{y}^{{2}}}}
f
(
x
,
y
)
=
1
+
x
2
+
y
2
1
-
a
b
c
d
e
f
(
x
,
y
)
=
x
2
+
y
2
\displaystyle {f{{\left({x},{y}\right)}}}={x}^{{2}}+{y}^{{2}}
f
(
x
,
y
)
=
x
2
+
y
2
-
a
b
c
d
e
f
(
x
,
y
)
=
x
2
+
y
\displaystyle {f{{\left({x},{y}\right)}}}={x}^{{2}}+{y}
f
(
x
,
y
)
=
x
2
+
y
-
a
b
c
d
e
f
(
x
,
y
)
=
y
2
\displaystyle {f{{\left({x},{y}\right)}}}={y}^{{2}}
f
(
x
,
y
)
=
y
2
-
a
b
c
d
e
f
(
x
,
y
)
=
x
2
+
2
⋅
y
2
\displaystyle {f{{\left({x},{y}\right)}}}=\sqrt{{{x}^{{2}}+{2}\cdot{y}^{{2}}}}
f
(
x
,
y
)
=
x
2
+
2
⋅
y
2
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