Download Algebraic Expressions - ED204

ALGEBRAIC
EXPRESSIONS
Ana Salceda
Pre-Algebra 1A
Mrs. Ruiz
Period 4
UNDERSTANDING VOCABULARY


Variable: Letter used
to represent a number
value
Evaluate: substitute
number values into an
expression.
UNDERSTANDING EXPRESSIONS

Letters stand for
numbers.

Remember the order
of operations:




Perform appropriate
operation



Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
BE CAUTIOUS


Know what variable
belongs to what part
of the equation
Do not loose the
parenthesis


Be EXTRA careful
with negative
numbers
Solve using
P.E.M.D.A.S.
EVALUATION EXAMPLE:

2x3 – x2 + y
for x = 3, y = –2

2(3)3 – (3)2 + (-2)

2(27) - 9 + (-2)

54 - 9 +(-2)

43
SENTENCES AS ALGEBRAIC EQUATION
A number increased by nine is fifteen
y+9=15
 Four less than a number is twenty
x-4=20
 Thirty two is twice a number increased by eight
32=2a+8
 Twice a number, decreased by twenty-nine is
seven
2t-29=7

CONTINUE
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A large pizza pie with 15 slices is shared among
P students so that each student’s share is 3 slices
15/P=3
Suzanne made a withdrawal of D dollars from
her savings account. Her old balance was $350
and her new balance is $280
350-D=280
Eleni is X years old in thirteen years she will be
twenty-four years old
x+14=24