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Let’s check out your problem:
Learn with an example
\newline
or
\newline
Solve for
b
b
b
in the proportion.
\newline
10
8
=
b
12
b
=
□
\begin{array}{l} \frac{10}{8}=\frac{b}{12} \\ b=\square \end{array}
8
10
=
12
b
b
=
□
\newline
Submit
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Home
Math Problems
Algebra 2
Write and solve direct variation equations
Full solution
Q.
Learn with an example
\newline
or
\newline
Solve for
b
b
b
in the proportion.
\newline
10
8
=
b
12
b
=
□
\begin{array}{l} \frac{10}{8}=\frac{b}{12} \\ b=\square \end{array}
8
10
=
12
b
b
=
□
\newline
Submit
Identify Proportion:
Identify the proportion and set up the equation.
\newline
We have the proportion
10
8
=
b
12
\frac{10}{8} = \frac{b}{12}
8
10
=
12
b
.
Cross-Multiply:
Cross-multiply to solve for b.
\newline
10
×
12
=
8
×
b
10 \times 12 = 8 \times b
10
×
12
=
8
×
b
\newline
120
=
8
b
120 = 8b
120
=
8
b
Divide to Isolate b:
Divide both sides by
8
8
8
to isolate b.
\newline
b
=
120
8
b = \frac{120}{8}
b
=
8
120
\newline
b
=
15
b = 15
b
=
15
More problems from Write and solve direct variation equations
Question
In a direct variation,
y
=
15
y=15
y
=
15
when
x
=
5
x=5
x
=
5
. Write a direct variation equation that shows the relationship between
x
x
x
and
y
y
y
. Write your answer as an equation with
y
y
y
first, followed by an equals sign.
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Posted 2 months ago
Question
In an inverse variation,
y
=
4
y = 4
y
=
4
when
x
=
6
x = 6
x
=
6
. Write an inverse variation equation that shows the relationship between
x
x
x
and
y
y
y
. Write the equation using a decimal or an integer.
_
_
_
_
\_\_\_\_
____
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Posted 2 months ago
Question
The quantity
z
z
z
varies directly with
y
y
y
and inversely with
x
x
x
. When
y
=
−
12
y = -12
y
=
−
12
and
x
=
−
4
x = -4
x
=
−
4
,
z
=
−
36
z = -36
z
=
−
36
. What is the equation of variation? Write your answer in the form
A
A
A
or
A
B
\frac{A}{B}
B
A
, where
A
A
A
and
B
B
B
are constants or variable expressions. Remember to include the value of
k
k
k
, the constant of variation, in exact form.
\newline
z
\ z
z
=______
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Posted 2 months ago
Question
Which equation describes this relationship? Remember to include
k
k
k
, the constant of variation.
a
a
a
varies directly with
b
b
b
and inversely with
c
c
c
and
d
d
d
\newline
Choices:
\newline
\[[A]a = \frac{kb}{cd}\]
\newline
\[[B]a = \frac{kbd}{c}\]
\newline
\[[C]a = \frac{k}{bcd}\]
\newline
\[[D]a = \frac{kd}{bc}\]
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Posted 2 months ago
Question
The quantity
z
z
z
varies directly with
y
y
y
and inversely with
w
w
w
and
x
x
x
. When
y
=
12
y = 12
y
=
12
,
w
=
8
w = 8
w
=
8
, and
x
=
–
5
x = –5
x
=
–5
,
z
=
–
3
z = –3
z
=
–3
. What is the value of
k
k
k
, the constant of variation?
\newline
Write your answer in the form
A
A
A
or
(
A
)
(
B
)
\frac {(A)}{(B)}
(
B
)
(
A
)
, where
A
A
A
and
B
B
B
are constants or variable expressions.
\newline
____
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Posted 2 months ago
Question
Given the substitutions
ln
2
=
a
,
ln
3
=
b
\ln 2=a, \ln 3=b
ln
2
=
a
,
ln
3
=
b
, and
ln
5
=
c
\ln 5=c
ln
5
=
c
, find the value of
ln
(
e
3
)
\ln \left(\frac{e}{3}\right)
ln
(
3
e
)
in terms of
a
,
b
a, b
a
,
b
, and
c
c
c
.
\newline
Answer:
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Posted 2 months ago
Question
Square VWXY is dilated by a scale factor of
6
6
6
to form square
V
′
W
′
X
′
Y
′
V^{\prime} W^{\prime} X^{\prime} Y^{\prime}
V
′
W
′
X
′
Y
′
. Side W'X' measures
12
12
12
. What is the measure of side WX?
\newline
Answer:
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Posted 2 months ago
Question
х +
6
6
6
у = r -
2
2
2
х
\newline
2
2
2
(x+
4
4
4
) +
2
2
2
y =
11
11
11
+ \frac{
1
1
1
}{
2
2
2
}(
16
16
16
+
2
2
2
x)
\newline
In the system of equations, r is a constant. For what value of r does the system of linear equations have infinitely many solutions?
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Posted 2 months ago
Question
Question
1
1
1
of
5
5
5
\newline
Use the given information to find
m
∠
P
Q
W
m \angle P Q W
m
∠
PQ
W
\newline
(Chapter
2
2
2
)
\newline
Find
m
∠
P
Q
W
m \angle P Q W
m
∠
PQ
W
if
m
∠
W
Q
R
=
134
x
m \angle W Q R=134 x
m
∠
W
QR
=
134
x
,
m
∠
P
Q
R
=
16
9
∘
m \angle P Q R=169^{\circ}
m
∠
PQR
=
16
9
∘
, and
m
∠
P
Q
W
=
36
x
−
1
m \angle P Q W=36 x-1
m
∠
PQ
W
=
36
x
−
1
.
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Posted 2 months ago
Question
10
+
7
x
=
4
x
+
2
+
b
x
10+7 x=4 x+2+b x
10
+
7
x
=
4
x
+
2
+
b
x
\newline
In the equation shown,
b
b
b
is a constant. For what value of
b
b
b
does the equation have no solutions?
\newline
Choose
1
1
1
answer:
\newline
(A)
3
3
3
\newline
(B)
5
5
5
\newline
(C)
6
6
6
\newline
(D)
7
7
7
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Posted 2 months ago