1. Determine the slope of the line graphed below. A. B. C. 0 D. Hint 2. Determine the slope of the line that passes through (2, 2) and (5, 8). A. B. 2 C. D. -2 Hint 3. Three out of the four equations listed below are equations of lines that are parallel to each other. Which equation does not have a graph that is a line parallel to the other three? A. 3x + 4y = -16 B. 8y = - 6x C. D. Hint 4. Which pair of lines graphed below are parallel? A. k and n B. l and m C. l and n D. k and m Hint 5. The table shows the possible lengths and widths of a rectangle that has an area of 72 square centimeters. Make a scatter plot of the data. A. B. C. D. Hint 6. Use the scatter plot to predict the mileage of an engine with 250 horsepower. A. 10 B. 20 C. 12 D. 25 Hint 7. Determine the slope of the line containing the points P(-7, -8) and Q(3, 0). A. B. C. -2 D. 2 Hint 8. The graph of a linear function is _______. A. a curved line B. a horizontal line only C. None of these is correct D. a straight line Hint 9. Which characteristic describes a graph that is linear and has direct variation. A. The equation has the form y = mx + b. B. The graph does not pass through (0, 0). C. The equation has the form y = mx. D. Variables x and y are not proportional. Hint 10. Find the equation that has direct variation. A. y = –3x – 1 B. y = 4x C. y = 5x + 1.3 D. y = 0.8x + 9 Hint 11. Find the equation that contains a decreasing linear relationship. A. y = 5 – 6x B. y = 4x – 3 C. y = 12+ 2x D. y = 10 + x Hint 12. Find the situation that involves a decreasing linear relationship and has direct variation. A. An airplane that begins at 20,000 feet and descends for a landing on the ground at the airport. B. A submarine that begins at the bottom of the ocean and is raised to the surface of the water at 15 meters per second. C. The temperature that begins at 0°F at 6:00 a.m. rises 3°F every hour for 6 hours. D. A bucket that begins at ground level and is lowered into a well at a rate of 1 foot per second. Hint 13. Find the situation that is linear but does not have direct variation. A. At the beginning of the summer, Dina had \$200 in the bank. She started a job and deposited \$10 per week. B. At the beginning of the summer, Dina had \$0 in the bank. She earned \$50 mowing lawns the previous week and deposited the money in the bank. C. At the beginning of the summer, Dina had \$200 in the bank. She withdrew \$30 to buy a new pair of shorts. D. At the beginning of the summer, Dina had \$0 in the bank. She started a job and deposited \$10 per week. Hint 14. Find the graph that is nonlinear. A. B. C. D. Hint 15. Find the equation that is nonlinear. A. y = 14 + 6x B. y = –3x – 1 C. y = 4y2 D. y = 8 – x Hint 16. Find the table that represents a graph with direct variation. A. B. C. D. Hint 17. Michael just got a job mowing his elderly neighbor's lawn paying him \$10 each week. Draw a graph showing the amount he receives is increasing very rapidly. Suppose you graph the time in weeks on the horizontal axis and the amount Michael receives on the vertical axis. A. B. C. D. Hint 18. Pam's mother gives Pam \$20 each week for lunch to be bought at the school cafeteria. Lunches cost \$4 per day. Draw a graph showing the amount Pam has left decreasing very slowly. Suppose you graph the time in days on the horizontal axis and the amount Pam has left on the vertical axis. A. B. C. D. Hint 19. What is the equation of a line that has a slope of 3 and passes through (–4, –3)? A. y = 3x – 9 B. y = 3x – 3 C. y = 3x + 3 D. y = 3x + 9 Hint 20. Which three points are collinear? A. (3, 1), (4, 0), (–1, 2) B. (–5, –3), (–2, 3), (2, –4) C. (–1, 1), (2, 3), (5, 2) D. (4, –3), (2, –2), (–4, 1) Hint