Determine whether x=5 is the solution to -7+x=2.

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lemjay | High School Teacher | (Level 3) Senior Educator

Posted on

To determine if x=5 is a solution, plug-in this to the equation.

`-7+x=2`

`-7+5=2`

`-2=2`      (False)

Since the resulting condition is False, hence x=5 is not the solution of `-7 + x = 2` .

To determine the solution of the given equation, move 7 to the right. To do so, add both sides by 7.

`-7+x=2`

`-7+7+x=2+7`

`x=9`

Hence, the solution of `-7+x=2` is `x=9` .

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jess1999 | Student, Grade 9 | (Level 1) Valedictorian

Posted on

There are two ways to figure out whether x=5 is the solution to -7+x=2.

The first way is to solve the equation to find " x " the second way is to plug in " x" since you know what it is

The First Way :

-7 + x = 2 add 7 on both sides

By adding, you should get

x = 9 which means that x does not equal 5

The Second Way :

-7 + 5 = 2 add -7 and 5

By adding, you should get

-2 = 2 since -2 does not = to 2 your " x " variable will not = to 5

atyourservice's profile pic

atyourservice | Student, Grade 11 | (Level 3) Valedictorian

Posted on

-7+x=2     x=5  plug in the 5
-7+5=2

-7+5=-2 so it is false, in order to find the real one you should do the following

-7+x=2 

+7   +7

x=9 so 9 is the real answer

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