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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. Finding Unknown Angle Measures
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Exercise 4 Page 394

What can you do to isolate a variable in an inequality?

z > -3

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. The only difference is that when we divide or multiply by a negative number, we must reverse the inequality sign.
1.1z > -3.3
DivIneq

.LHS /1.1.>.RHS /1.1.

z > -3.3/1.1
MoveNegNumToFrac

Put minus sign in front of fraction

z > - 3.3/1.1
CalcQuot

Calculate quotient

z > -3
The above tells us that all values of z that are greater than - 3 will satisfy the inequality. Below we graph the inequality. Notice that z cannot equal - 3, which we show with an open circle on the number line.
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arrow_right Try It p.390-392
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Try It 2 (Page 391)
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arrow_right Self-Assessment for Concept & Skills p.392
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arrow_right Self-Assessment for Problem Solving p.393
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arrow_right Review & Refresh p.394
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