5 lesson 2 1 variables & expressions
- 1. Name _________________________________ Date __________________________ Mrs. Labuski / Mrs. Portsmore Period _______ Lesson 2-1 Variables & Expressions Essential Question: How do you identify and describe parts of an expression? VOCABULARY DEFINITION EXAMPLE constant variable algebraic expression term coefficient Identify the coefficient and the variable in each algebraic expression. 1.) 4b 2.) 74x 3.) 5y
- 2. coefficient ________ coefficient ________ coefficient ________ variable __________ variable __________ variable __________ 4.) 4x – 12 5.) a + 3b 4 is a(n) ___________________ a is a(n) ___________________ x is a(n) ___________________ 3 is a(n) ___________________ 12 is a(n) __________________ b is a(n) __________________ terms: _____________________ terms: _____________________ Evaluate each expression for the given value of the variable. 6.) x + 5, for x = 6 7.) 3p, for p = 5 8.) z ÷ 4, for z = 24 ________________ ________________ ________________ Evaluate each expression to find the missing values or missing expression in the tables. n n+8 n 7n n 7 15 7 49 35 50 9 8 5 20 22 6 20 35 35 9 85 100 n 25 - n n 24 ÷ n n 20 5 2 12 13 26 5 6 9 18 18 4 30 60 9 8 25 50 Shawn evaluated the algebraic expression x ÷ 4 for x = 12 and gave an answer of 8. What was his error? What was the correct answer? _____________________________________________________________________________ _____________________________________________________________________________ Name _________________________________ Date __________________________ Mrs. Labuski / Mrs. Portsmore Period _______ Lesson 2-1 Variables & Expressions
- 3. Essential Question: How do you identify and describe parts of an expression? VOCABULARY DEFINITION EXAMPLE A number that is alone. It 4, 5, 6, constant is a value that does not (any number) change. A letter or symbol used to x=6 represent a number that variable any letter can be we don’t know yet. The used value that can change. A mathematical phrase algebraic that contains at least one x+2 expression variable the parts of an expression 3x + 4 term that are separated by a + 3x = term or - sign 4 = term 4x is the a number used to multiply (same as 4• x) coefficient a variable the “4” is the coefficient Identify the coefficient and the variable in each algebraic expression. 1.) 4b 2.) 74x 3.) 5y coefficient __4______ coefficient __74______ coefficient __5______
- 4. variable ____b______ variable ____x______ variable ___y_______ 4.) 4x – 12 5.) a + 3b 4 is a(n) ___coefficeint__________ a is a(n) __ variable x is a(n) ___variable______________ 3 is a(n) ___ coefficeint 12 is a(n) ____constant______________ b is a(n) _____ variable terms: __4x, 12 terms: a, 3b Evaluate each expression for the given value of the variable. 6.) x + 5, for x = 6 7.) 3p, for p = 5 8.) z ÷ 4, for z = 24 6+5 3•5 24 ÷ 4 ______11__________ _____ 15_________ ________6________ Evaluate each expression to find the missing values or missing expression in the tables. n n+8 n 7n n n + 15 7 15 7 49 35 50 9 17 8 56 5 20 22 30 6 42 20 35 35 43 9 63 85 100 n 25 - n n 24 ÷ n n n• 2 or 2n 20 5 2 12 13 26 5 20 6 4 9 18 18 7 4 6 30 60 9 16 8 3 25 50 Shawn evaluated the algebraic expression x ÷ 4 for x = 12 and gave an answer of 8. What was his error? What was the correct answer? He subtracted instead of divided. The answer should have been 3