Page 32 - Math Course 1 (Book 2)

Solving Open Sentence Equations

Skill Practice!

Find the solution of each equation if the replacement sets are A = {4, 5, 6, 7, 8} and B = {9, 10, 11, 12, 13}.

1. 5a – 9 = 26 2. 4a – 8 = 16

3. 7a + 21 = 56 4. 3b + 15 = 48

5. 4b – 12 = 28

Find the solution set for each inequality using the given replacement set.
6. a + 7 < 10; {2, 3, 4, 5, 6, 7} 7. 3y ≥ 42; {10, 12, 14, 16, 18}

8. 4x – 2 < 5; {0.5, 1, 1.5, 2, 2.5} 9. 4b – 4 > 3; {1.2, 1.4, 1.6, 1.8, 2.0}

10-12. TEACHING A teacher has 15 weeks in 13-14. LONG DISTANCE For Exercises 13 and
which to teach six chapters. Write and then solve an 15, use the following information.
equation that represents the number of lessons the Gabriel talks an average of 20 minutes per long-dis-
teacher must teach per week if there is an average of tance call. During one month, he makes eight
8.5 lessons per chapter. in-state long-distance calls averaging $2.00 each. A
20-minute state-to-state call costs Gabriel $1.50. His
long-distance budget for the month is $20.

Write an inequality that represents the number of
20 minute state-to-state calls Gabriel can make this
month.

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