Big Ideas Math: Modeling Real Life, Grade 7
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4. Writing and Graphing Inequalities
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Exercise 18 Page 149

Substitute 4 into the given inequality and then simplify.

Yes.

Practice makes perfect
We can determine whether 4 is a solution by substituting it into the inequality and simplifying.
n + 8 ≤ 13
4 + 8 ? ≤ 13
12 ≤ 13 ✓
Since 12 is less than 13, 4 is a solution.