Pearson Algebra 1 Common Core, 2011
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Pearson Algebra 1 Common Core, 2011 View details
8. An Introduction to Equations
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Exercise 8 Page 56

Are there any unknown variables?

Open

Practice makes perfect
Consider the given equation. 225Ă·t-4=6.4 To determine whether this equation is true, false, or open, we need to simplify it by following the Order of Operations.
225Ă· t -4=6.4
225/t-4=6.4
225/t=6.4+4
225/t=10.4
Notice the variable t in the equation. We cannot know whether the statement is true or false because the variable t can represent any number. Thus, the equation is open.