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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
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