3 Responses to “if x-10=35, which property of equality for real numbers justifies that x=45?”

1. ironduke8159
   Comment by ironduke8159 | 02/15/09 at 10:34 am

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   The addition property
   If a = b, then a + c = b + c.

   Euclid states that if equals are added to equals, then the sums are equal.

2. smokedhamm69
   Comment by smokedhamm69 | 02/15/09 at 10:21 pm

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   C. The additive property of equality allows you to add the same value to both sides of the equation in order to solve for x.

3. Mathendacil
   Comment by Mathendacil | 02/19/09 at 5:20 am

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   Reflexivity means that a=a.
   Symmetry means that if a=b then b=a
   “Addition property” means that if a=b then a+c=b+c
   “Multiplicative property” means that if a=b then a*c=b*c.

   To infer x=45 from x-10=35, you do in fact:
   x-10=35 therefore x-10+10=35+10
   Now you should see which of the four it is.

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