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Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
5. Solving Inequalities Using Addition or Subtraction
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Exercise 15 Page 155

Use the Subtraction Property of Inequality.

Solution: k ≤ - 11
Graph:

Practice makes perfect
Inequalities can be solved in the same way as equations, by performing inverse operations on both sides until the variable is isolated. Let's use the Subtraction Property of Inequality to solve the inequality.
8 + k ≤ - 3
SubIneq

LHS-8≤RHS-8

8 + k - 8 ≤ - 3 - 8
CommutativePropAdd

Commutative Property of Addition

k + 8 - 8 ≤ - 3 - 8
SubTerms

Subtract terms

k ≤ - 11
The above tells us that all values of k that are less than or equal to - 11 will satisfy the inequality. Below we demonstrate the inequality by graphing the solution set on a number line. Notice that k can equal - 11, which we show with a closed circle on the number line.
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arrow_right Self-Assessment for Concept & Skills p.153
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arrow_right Self-Assessment for Problem Solving p.154
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arrow_right Review & Refresh p.155
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