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Sagot :

9514 1404 393

Explanation:

There are a few basic rules of Algebra. These are broken apart into numerous special cases and each of those is given a name. Here, you're expected to know the names of those "special case" rules.

The basic ideas are ...

  • you can (must) always do the same thing to both sides of the equal sign
  • things that are equal can always be substituted for each other

We divide that first idea into several "properties of equality":

  • addition property of equality: you can add the same to both sides
  • subtraction property of equality: you can subtract the same from both sides
  • multiplication property of equality: you can multiply both sides by the same
  • division property of equality: you can divide both sides by the same

The second idea is used to give you other properties:

  • distributive property: a(b+c) = ab +ac
  • transitive property: a = b & b = c ⇒ a = c
  • substitution property: a = b & a = c ⇒ b = c
  • reflexive property: a = a
  • symmetric property: a = b ⇒ b = a

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3. The rules used in this solution are ...

  • given
  • distributive property
  • subtraction property of equality (subtract 2x)
  • addition property of equality (add 15)
  • division property of equality (divide by 5)
  • symmetric property

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4. The rules used in this solution are ...

  • given
  • distributive property
  • addition property of equality (add 4x)
  • subtraction property of equality (subtract 4)
  • division property of equality (divide by 6)
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