1. The set of all first coordinates, or x-coordinates, from the ordered pairs in a relation is called the_______. A. domain B. range C. related coordinates D. ordered coordinates Hint 2. Which table is represented by the graph? A. B. C. D. Hint 3. The set of solutions to an equation in two variables is called the______. A. domain set B. solution set C. identity D. range set Hint 4. Solve the equation 10x - 5y = 15 if the domain is {-2, -1, 0, 1, 2}. A. {(-2, 2), (-1, 1), (0, 0), (1, 2), (2, 1)} B. {(-2, -7), (-1, -5), (0, -3), (1, -1), (2, 1)} C. {(-2, -2), (-1, -1), (0, 0), (1, 1), (2, 2)} D. {(2, -1), (-1, 1), (0, 3), (1, 5), (2, 7)} Hint 5. Which equation is a linear equation? A. y2 = 9 B. xy = 7 C. 3x + 3xy + y = 10 D. -2x = 5y + 1 Hint 6. A relation in which each member of the domain is paired with exactly one member of the range is called a(n)_______. A. equivalent relation B. equivalent equation C. ordered relation D. function Hint 7. The relation {(4, 6), (6, 1), (10, 2), (5, -1), (10, -2), (2, 6)} is _______. A. not a function, because the domain value 10 is paired with more than one element of the range B. a function, because each element of the domain is paired with exactly one element of the range C. a function, because all of the elements of the domain are positive D. not a function, because the range value 6 is paired with more than one element of the domain Hint 8. Consider the equation y = kx. Which statement is not true? A. k is called the direction. B. y is called the dependent variable. C. k is called the constant of variation. D. x is called the independent variable. Hint 9. Suppose y varies directly as x and y = 42 when x = 3. Find x when y = 70. A. 2.5 B. 5 C. 1.8 D. 9.8 Hint 10. Suppose y varies inversely as x, and y = 9 when x = -4. What is the constant of variation? A. 36 B. -13 C. 5 D. -36 Hint 11. Which equation is not a linear equation? A. x= 0 B. xy + 2 = y C. 3x = 4y + x D. y = -4 Hint 12. Suppose y varies inversely as x and y = 3 when x = 8. Find y when x = 4. A. 12 B. 2 C. 1.5 D. 6 Hint