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Math Problems
Grade 8
Write and solve equations for proportional relationships
V
=
ℓ
w
h
V=\ell w h
V
=
ℓ
w
h
\newline
The formula gives the volume
V
V
V
of a right rectangular prism with length
ℓ
\ell
ℓ
, width
w
w
w
, and height
h
h
h
. What is the volume, in cubic meters, of a rectangular prism that is
6
6
6
meters long,
2
2
2
meters wide, and
10
10
10
meters tall?
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Addison painted her room. She had
50
50
50
square meters to paint, and she painted at a constant rate. After
2
2
2
hours of painting, she had
35
35
35
square meters left.
\newline
Let
y
y
y
represent the area (in square meters) left to paint after
x
x
x
hours.
\newline
Complete the equation for the relationship between the area and number of hours.
\newline
y
=
y=
y
=
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Read the description of a proportional relationship. Every spring, Kenny plants colorful flowers in his garden. This year, he decides to plant petunias. He buys them at the garden store, brings them back home, and starts planting. There is a proportional relationship between the amount of time (in minutes) Kenny has been working in his garden,
x
x
x
, and the number of petunias he has planted,
y
y
y
. After working in his garden for
2
2
2
minutes, Kenny has planted
4
4
4
petunias. Write the equation for the relationship between
x
x
x
and
y
y
y
.
y
=
_
_
_
y = \_\_\_
y
=
___
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