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What is the Substitution Property of Equality?

Definition: Substitution Property of Equality

Summary

  1. x is a variable
  2. In our first example, let's make x equal to 4
  3. z is a variable
  4. We can plug each value we are given for z into the expression, since they mean the same thing

Notes

    1. x is a variable
    2. If we know the value of a variable, we can substitute that value into the expression for the variable
    1. If a and b mean are equal, that means they have the same value
    2. So you can use either one and the expression will be the same!
    1. Our variable here is z
    2. Since we were given values for z, we can substitute those values in instead of z