188 Chapter 2 Linear Equations in Two Variables and Functions Section 2.5 Practice Exercises Study Skills Exercise A good way to determine what will be on a test is to look at both your notes and the exercises assigned by your instructor. List five kinds of problems that you think will be on the test for this chapter. Vocabulary and Key Concepts 1. a. A set of ordered pairs (x, y) is called a in x and y. b. The of a relation is the set of first components in the ordered pairs. c. The of a relation is the set of second components in the ordered pairs. Review Exercises 2. Write an equation of a line passing through the points (3, 4) and (1, 6). Write the answer in slope-intercept form. For Exercises 3–6, a. Determine if the equation represents a horizontal line, a vertical line, or a slanted line. b. Determine the slope of the line (if it exists). c. Determine the x-intercept (if it exists). d. Determine the y-intercept (if it exists). 3. 2x 3 4 4. 2x 3y 4 5. 3x 2y 4 6. 2 3y 4 Concept 2: Domain and Range of a Relation For Exercises 7–14, a. Write the relation as a set of ordered pairs. b. Determine the domain and range. (See Examples 1–3.) 7. 8. Number Living in Region Poverty (thousands) Northeast 54.1 Midwest 65.6 South 110.7 West 70.7 9. 10. x y 0 3 2 7 1 2 8 5 1 12 Year of First Man Country or Woman in Space USSR 1961 USA 1962 Poland 1978 Vietnam 1980 Cuba 1980 Year of State, Statehood, x y Maine 1820 Nebraska 1823 Utah 1847 Hawaii 1959 Alaska 1959
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