6th Grade Math Quiz
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EXPRESSIONS AND EQUATIONS
Question 1
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A teacher asks: "Is
x
=
9
x=9
x
=
9
a solution to
2
x
=
18
2x=18
2
x
=
18
?" Choose the statement that correctly checks by substitution.
A
Substitute:
2
(
9
)
=
18
2(9)=18
2
(
9
)
=
18
, so
18
=
18
18=18
18
=
18
(true). Yes,
x
=
9
x=9
x
=
9
is a solution.
B
Substitute:
2
(
9
)
=
18
2(9)=18
2
(
9
)
=
18
, so
2
=
18
2=18
2
=
18
(false). No,
x
=
9
x=9
x
=
9
is not a solution.
C
Substitute:
2
(
9
)
=
18
2(9)=18
2
(
9
)
=
18
, so
9
=
18
9=18
9
=
18
(false). No,
x
=
9
x=9
x
=
9
is not a solution.
D
Substitute:
2
(
9
)
=
18
2(9)=18
2
(
9
)
=
18
, so
18
=
9
18=9
18
=
9
(false). No,
x
=
9
x=9
x
=
9
is not a solution.
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