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 13 Page 56

Are there any unknown variables?

Open

Practice makes perfect
Consider the given equation.

4a-3b=21 To determine whether this equation is true, false, or open, we only need to notice the variables a and b in the equation. We cannot know whether the statement is true or false because the variables a and b can represent any number. Thus, the equation is open.