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 15 Page 56

Are there any unknown variables?

Open

Practice makes perfect
Consider the given equation.

5x+7=17 To determine whether this equation is true, false, or open, we only need to notice the variable x in the equation. We cannot know whether the statement is true or false because the variable x can represent any number. Therefore, this equation is open.