Download notes 25 Algebra Variables and Expressions

Algebra: Variables and
Expressions
#25
Vocabulary
• Algebra is a language of symbols
including variables.
• A variable is a symbol, usually a
letter, used to represent a number.
• Algebraic expressions contain at
least one variable and at least one
operation.
• Evaluate is to find the value of an
algebraic expression by replacing
variables with numbers.
Algebraic Expressions
150 + y
35  w + z
NOT Algebraic Expressions
85 ÷ 5
10 + 3  5
I DO (foldable)
Evaluate
z ÷ 5 + 4 for z = 20
1) Substitute numbers for variables
(plug in #)
2) Use order of operations to
simplify (PEMDAS)
1 2
3
4
WE DO (notes)
WE DO (notes)
YOU DO (classwork)
• ADV Practice pg.453 #1-15 ALL
• REG Practice pg.453 #2-14 EVEN
https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6thexpressions-and-variables/cc-6th-substitution/v/variables-andexpressions-1
https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6thexpressions-and-variables/cc-6th-substitution/v/evaluatingexpressions-in-two-variables