Name Date Class s1

Name______Date______Class______Problem Solving Line of Best Fit 1. The table shows the number of hours different players practice basketball each week and the number of baskets each player scored during a game.

Player Alan Brenda Caleb Shawna Fernando Gabriela Hours 5 10 7 2 0 21 Practiced Baskets 6 11 8 4 2 19 Scored a. Find an equation for a line of best fit. Round decimals to the nearest tenth. ______

b. Interpret the meaning of the slope and y-intercept. ______

c. Find the correlation coefficient. ______

Select the best answer. 2. Use your equation above to predict the 4. Given the data, what advice can you give number of baskets scored by a player to a player who wants to increase the who practices 40 hours a week. Round number of baskets he or she scores to the nearest whole number. during a game? A 32 baskets A Practice more hours per week. B 33 baskets B Practice fewer hours per week. C 34 baskets C Practice the same hours per week. D 35 baskets D There is no way to increase baskets.

3. Which is the best description of the 5. Do the data support causation, correlation? correlation, or chance? F strong positive F correlation G weak positive G causation H weak negative H chance J strong negative J chance and correlation

© Houghton Mifflin Harcourt Publishing Company Holt McDougal Coordinate Algebra Name______Date______Class______quadratic equation perfectly models the data. For the next fundraiser, Ellen will raise $30,000 according to the linear model y  6x  6, or $37,000 according to the quadratic model y  x2  1. 10. Problem Solving 1. a. y  0.8x  2.3 Practice B b. Slope: for each hour practiced, a player will score 0.8 baskets; y-int.: 1. 2 2. 1 a player who practices 0 h will score 3. 3 4. rotation 2.3 baskets. 5. G(2.5, 4), H(3.5, 2), I(4, 4), J(5, 6) c. 0.998 6. (x, y)  (x  7, y  5) 2. C 3. F 7. 4. A 5. G

Reading Strategies 1. y  0.8x0.5 2. 0.8 3. 1.3; 2.1; 2.9; 3.7 4. 0.3; 0.9; 0.9; 0.3 Practice C 5. 0.09; 0.81; 0.81; 0.09 6. 1.8 Answer Key for Unit 5 1. △PQR TRANSFORMATIONS IN THE COORDINATE PLANE 2. The vertex labels do not match. For the rotation, P moves to Q and Q moves to Practice A P. 1. transformation 2. original; image 3. △ABC and △PQR 3. reflection 4. slide 4. (x, y) 5. (y, x) 5. rotation 6. (x, y) 7. (x, y) 6. 2; ABCD  ABCD 8. (x, y)  (x  3 , y  1) 7. 3; △PQR  △PQR 9. 120 meters 8. 1; △HIJ  △HIJ Review for Mastery 1. translation; possible answer: △FGH △FGH 2. reflection; possible answer: △MNP 9. reflection △MNP 3. reflection; possible answer: △WXY △WXY