I'm thinking of a number. When I double my number and then subtract the result from five I get negative one. What is my number

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22-01-2015
Mathematics

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I'm thinking of a number. When I double my number and then subtract the result from five I get negative one. What is my number

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naǫ naǫ · Answer 1 · 2015-01-22T16:00:17+01:00

naǫ naǫ

22-01-2015

x - the number
you double the number - 2x
you subtract the result from five - 5-2x
you get negative one - 5-2x=-1

[tex]5-2x=-1 \\ -2x=-1-5 \\ -2x=-6 \\ x=\frac{-6}{-2} \\ x=3[/tex]

The number is 3.

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