Authors and Advisors vi
Using the Homework Helper viii
Grade 8 TEKS x
Unit A: Number and Operations
Topic 1: Rational and Irrational Numbers
1-1: Exploring Irrational Numbers 1
1-2: Approximating Irrational Numbers 8
1-3: Comparing and Ordering Rational and Irrational Numbers 15
1-4: Exploring Scientific Notation 21
1-5: Using Scientific Notation to Describe Very Large Quantities 27
1-6: Additional Problem Solving 33
Unit B: Proportionality
Topic 2: Proportional Relationships, Lines, and Linear Equations
2-1: Representing Proportional Relationships 40
2-2: Linear Equations: y = mx 47
2-3: The Slope of a Line 52
2-4: Unit Rates and Slope 60
2-5: The y-intercept of a Line 66
2-6: Linear Equations: y = mx + b 71
2-7: Distinguishing Between Proportional and Non-Proportional Situations 78
2-8: Additional Problem Solving 86
Topic 3: Defining and Comparing Functions
3-1: Recognizing a Function 91
3-2: Representing a Function 99
3-3: Linear Functions 107
3-4: Nonlinear Functions 114
3-5: Additional Problem Solving 119