Chapter 4 An Introduction to Functions

Chapter 4 Get Ready!

• Lesson 1-2 Evaluating Expressions

• Evaluate each expression for the given value(s) of the variable(s).

  1. 3 x − 2 y ; x = − 1 , y = 2 3 x minus 2 y semicolon x equals negative 1 comma y equals 2
  2. − w 2 + 3 w ; w = − 3 negative , w squared , plus 3 w semicolon w equals negative 3
  3. 3 + k k ; k = 3 fraction 3 plus k , over k end fraction . semicolon k equals 3
  4. h − ( h 2 − 1 ) ÷ 2 ; h = − 1 h minus open , h squared , minus 1 close divides 2 semicolon h equals negative 1
• Lesson 1-9 Using Tables, Equations, and Graphs

• Use a table, an equation, and a graph to represent each relationship.

  5. Bob is 9 years older than his dog.
  6. Sue swims 1.5 laps per minute.
  7. Each carton of eggs costs $3.
• Review, page 60 Graphing in the Coordinate Plane

• Graph the ordered pairs in the same coordinate plane.

  8. ( 3 , − 3 ) open 3 comma negative 3 close
  9. ( 0 , − 5 ) open 0 comma negative 5 close
  10. ( − 2 , 2 ) open negative 2 comma 2 close
  11. ( − 2 , 0 ) open negative 2 comma 0 close
• Lesson 2-2 Solving Two-Step Equations

• Solve each equation. Check your answer.

  12. 5 x + 3 = − 12 5 x plus 3 equals negative 12
  13. n 6 − 1 = 10 n over 6 , minus 1 equals 10
  14. 7 = x + 8 2 7 equals . fraction x plus 8 , over 2 end fraction
  15. x − 1 4 = 3 4 fraction x minus 1 , over 4 end fraction . equals , 3 fourths
• Lesson 3-7 Solving Absolute Value Equations

• Solve each equation. If there is no solution, write no solution.

  16. | r + 2 | = 2 vertical line r plus 2 vertical line equals 2
  17. − 3 | d − 5 | = − 6 negative 3 vertical line d minus 5 vertical line equals negative 6
  18. − 3.2 = | 8 p | negative 3.2 equals vertical line 8 p vertical line
  19. 5 | 2 x − 7 | = 20 5 vertical line 2 x minus 7 vertical line equals 20

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