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An expression is NOT an equation because it DOES NOT have an equal sign. There are 2 types of expressions Numerical 3x 3x + 10 Algebraic Notice there are no equal signs in these expressions so they are not equations !
copyright©amberpasillas2010 A numerical expression contains only numbers and symbols and NO LETTERS. 5 times 3 plus 8 (53) + 8
copyright©amberpasillas2010 An algebraic expression contains only numbers, symbols, and variables. It is sometimes referred to as a variable expression. The product of 3 and x 3x The sum of m and 8 m + 8 The difference of r and 2 r - 2
copyright©amberpasillas2010 What is a variable? A variable represents an unknown value. 1) 4 + x 2) 10 – ? 3) 5y 4) 20 A variable can be any letter of the alphabet since it represents an unknown.
copyright©amberpasillas2010 Word Phrases for multiplication are: The product of 5 and a number c Seven times a number t 6 multiplied by a number d 5 c or 5c 7 t or 7t 6 d or 6d
copyright©amberpasillas2010 The Placement rule for multiplication is: The product of 5 and a number c Seven times a number t 6 multiplied by a number d 5 c or 5c 7 t or 7t 6 d or 6d Always write the variable AFTER the number.
copyright©amberpasillas2010 Evaluate means to find the value of an algebraic expression by substituting numbers in for variables. m = m ?
copyright©amberpasillas2010 Evaluate means to find the value of an algebraic expression by substituting numbers in for variables. r = r ?
copyright©amberpasillas2010 Evaluate the variable expression when n = 6. 1)2) Evaluate just means solve by substitution.
copyright©amberpasillas2010 Evaluate the variable expression when n = 6. Evaluate just means solve by substitution. 3) 4)
copyright©amberpasillas2010 Evaluate the algebraic expression when n = 8. 1)2)
copyright©amberpasillas2010 Evaluate the expression if a = 3 and b = 4. 1)2)
copyright©amberpasillas2010 Evaluate the expression if a = 3 and b = 4. 3)4)
copyright©amberpasillas2010 Evaluate the expression if x = 5 and y = 3. 1) 2)
copyright©amberpasillas2010 An expression is NOT an equation because it does not have an equal sign. There are 2 types of expressions. NUMERICAL EXPRESSION: Contains only numbers and symbols. Example: ALGEBRAIC EXPRESSION: Contains numbers, symbols, and variables. Also known as a variable expression. Example: m + 8 A VARIABLE is a letter or symbol that represents a number. Example: x TYPES OF EXPRESSIONS #1
copyright©amberpasillas2010 #2 Show the substitution. Show your work down. Circle your answer. Show your work one step at a time down. No equal signs! Evaluate means solve. Evaluate i f x = 3 and y = 4
copyright©amberpasillas2010 Take out 2 sheets of paper!!!
Copyright©amberpasillas2010. An expression is NOT an equation because it DOES NOT have an equal sign. There are 2 types of expressions Numerical.
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Expressions, Identities, Formulae, Equations The following slides show examples of many common and sometimes important expressions, identities, formulae.
Variables and Expressions. Vocabulary Variable – A symbol, usually a letter of the alphabet, such as the letter n, that is used to represent a number.
Math Vocabulary. Algebra The area of mathematics where letters (like x or y) or other symbols are used to represent unknown numbers. Example: in x - 5.
Review: Algebra. Write numeric expressions: Numeric expressions are expressions written out as phrases Example: Written as: The difference.
Expressions Students will be able to identify, write, and evaluate simple expressions.
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Lesson 5.1/5.2 – Writing Expressions and Equations Write this TITLE down on your notes!!! 5.1 /5.2 Writing Expressions and Equations.
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