Answer Key 1. a. 7 = coefficient, 9 = constant, x = variable 5 b. 6 = coefficient, -5 = constant, y = variable 7 c. -2.7 = coefficient, 4.5 = constant, 14 z = variable -11 d. -9 = coefficient, -22 = constant, 3 w = variable 1 2. a. False; 5 is the coefficient OR -8 is the constant 2 b. True c. True d. False; -7 is the coefficient 7. No, Amy is not correct. When you simplify e. False; -9 is the constant OR the expression using the Order of Operations, -3 is the coefficient the first expression simplifies to: 3. and These answers are not equal. a. 4 = coefficient, 7 = constant, v = variable 8. b. 10 = coefficient, -8 = constant, x+4 u = variable 8x-16 c. -1.8 = coefficient, -3.6 = constant, 6x+24 w = variable –x+4 d. -2.2 = coefficient, -6.1 = constant, 8x+16 x = variable 4. 3.6x - 8.52 a. True 9. b. False; c is the variable OR 5x + 20 -2.1 is the constant 7x 84 – c. False; 5 is the constant OR 3x 42 – 2 is the coefficient + 2 –x d. False; -3 is the coefficient 5x 10 – e. True 4x +8 5. 7.5x 10.25 – 31 10. 3 Multiple Answers 24 Multiple Answers 57 Multiple Answers 57 Multiple Answers 32 Multiple Answers 4 11. 79 15x 11 8x + 8y 35 20x2 328 -6y 4 3x 6x2 52 6x + 3 8 3y 6. 12y 7 12. 32 -100 a. 10x + 10y +9 6 b. 4x + 7y
Answer Key 1. a. 7 = coefficient, 9 = constant, x = variable b. 6 = coefficient, -5 = constant, y = variable c. -2.7 = coefficient, 4.5 = constant, z = variable d. -9 = coefficient, -22 = constant, w = variable 2. a. False; 5 is the coefficient OR -8 is the constant b. True c. True d. False; -7 is the coefficient e. False; -9 is the constant OR -3 is the coefficient 3. a. 4 = coefficient, 7 = constant, v = variable b. 10 = coefficient, -8 = constant, u = variable c. -1.8 = coefficient, -3.6 = constant, w = variable d. -2.2 = coefficient, -6.1 = constant, x = variable 4. a. True b. False; c is the variable OR -2.1 is the constant c. False; 5 is the constant OR 2 is the coefficient d. False; -3 is the coefficient e. True 5. 31 3 24 57 57 32 4 79 11 35 328 4 52 8 6. 7 32 -100 6 5 7 14 -11 3 1 2 7. No, Amy is not correct. When you simplify the expression using the Order of Operations, the first expression simplifies to: and These answers are not equal. 8. x+4 8x-16 6x+24 –x+4 8x+16 3.6x - 8.52 9. 5x + 20 7x – 84 3x – 42 –x + 2 5x – 10 4x +8 7.5x – 10.25 10. Multiple Answers Multiple Answers Multiple Answers Multiple Answers Multiple Answers 11. 15x 8x + 8y 20x2 -6y 3x 6x2 6x + 3 3y 12y 12. a. 10x + 10y +9 b. 4x + 7y
expressions-classwork-homework-2015-09-04.docx