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Problem
Problem
If
f
(
x
)
=
a
x
+
b
f(x)=ax+b
f
(
x
)
=
a
x
+
b
and
g
(
x
)
=
c
x
+
d
g(x)=cx+d
g
(
x
)
=
c
x
+
d
, then
f
(
g
(
x
)
)
=
g
(
f
(
x
)
)
f(g(x))=g(f(x))
f
(
g
(
x
))
=
g
(
f
(
x
))
is equivalent to (a)
f
(
a
)
=
g
(
c
)
f(a)=g(c)
f
(
a
)
=
g
(
c
)
(b)
f
(
b
)
=
g
(
d
)
f(b)=g(d)
f
(
b
)
=
g
(
d
)
(c)
f
(
d
)
=
g
(
b
)
f(d)=g(b)
f
(
d
)
=
g
(
b
)
(d)
f
(
c
)
=
g
(
a
)
f(c)=g(a)
f
(
c
)
=
g
(
a
)
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