Answer:
-2
Step-by-step explanation:
Rewrite the equation as
6
y
=
−
12
x
.
6
y
=
−
12
x
Divide each term by
6
and simplify.
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Divide each term in
6
y
=
−
12
x
by
6
.
6
y
6
=
−
12
x
6
Cancel the common factor of
6
.
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y
=
−
12
x
6
Cancel the common factor of
−
12
and
6
.
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y
=
−
2
x
Since the equation can be written in the form
y
=
k
x
,
y
varies directly with
x
and
k
. The constant of variation,
k
, is
−
2
.
