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.) 5ycoefficient ________ 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

7 15

9

22

35

n 25 - n

20 5

5

18

9

n 7n

7 49

8

6

9

n 24 ÷ n

2 12

6

4

8

n

35 50

5 20

20 35

85 100

n

13 26

9 18

30 60

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

Essential Question: How do you identify and describe parts of an expression?

VOCABULARY DEFINITION EXAMPLE

constantA number that is alone. It

is a value that does not change.

4, 5, 6,(any number)

variable

A letter or symbol used to represent a number that we don’t know yet. The value that can change.

x = 6any letter can be

used

algebraic expression

A mathematical phrase that contains at least one

variable x + 2

termthe parts of an expression that are separated by a +

or - sign

3x + 43x = term4 = term

coefficienta number used to multiply

a variable

4x is the (same as 4 x)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______

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

7 15

9 17

22 30

35 43

n 25 - n

20 5

5 20

18 7

9 16

n 7n

7 49

8 56

6 42

9 63

n 24 ÷ n

2 12

6 4

4 6

8 3

n n + 15

35 50

5 20

20 35

85 100

n n• 2 or 2n

13 26

9 18

30 60

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