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2x + 5 = 3

what is x?

 Oct 27, 2017

Best Answer 

 #1
avatar+7348 
+1

2x + 5  =  3

                                    Subtract  5  from both sides of the equation.

2x + 5 - 5  =  3 - 5

                                    2x + 5 - 5 = 2x   and   3 - 5 = -2

2x  =  -2

                                    Divide both sides of the equation by  2 .

2x/2  =  -2/2

                                    2x/2 = x     and     -2/2 = -1

x  =  -1

 

You can plug this back into the original equation to see if it is true.

 

2(-1) + 5  =  3   ?

-2 + 5  =  3      This is true.

 Oct 27, 2017
edited by hectictar  Oct 27, 2017
 #1
avatar+7348 
+1
Best Answer

2x + 5  =  3

                                    Subtract  5  from both sides of the equation.

2x + 5 - 5  =  3 - 5

                                    2x + 5 - 5 = 2x   and   3 - 5 = -2

2x  =  -2

                                    Divide both sides of the equation by  2 .

2x/2  =  -2/2

                                    2x/2 = x     and     -2/2 = -1

x  =  -1

 

You can plug this back into the original equation to see if it is true.

 

2(-1) + 5  =  3   ?

-2 + 5  =  3      This is true.

hectictar Oct 27, 2017
edited by hectictar  Oct 27, 2017

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