Concepts/Examples/Drills

1. ALGEBRA
MS. REYBETH D. RACELIS,LPT

2. Algebra
is concerned with the study of
the variables represented by
letters and the operations
relating these variables.

3. OBJECTIVE
•Evaluate algebraic
expressions for given values
of the variable(s) involved.

4. CONCEPTS
SUBSTITUTION means replacing a variable
with a number.
EVALUATING ALGEBRAIC EXPRESSIONS
means obtaining or computing the value of
the expressions.
TO EVALUATE AN ALGEBRAIC
EXPRESSION substitute the variable by a
number and simplify the expression.

5. EXAMPLES:
EVALUATE THE FOLLOWING ALGEBRAIC
EXPRESSIONS
1.2y + 3 , when y = 3
2.3(a + 4) + (a – 2) when a = 6
3.2(x + 4) + 3(y – 3) when x = -3
and y = 5

6. DRILLS
Evaluate each of the following expressions. Use
the given value of each variable.
1. 7x + 4y x = -3 y = 2
2. 2x + y – 6 x = 4 y = -3
3. 3(a + 2b) a = 5 b = -5
4. 2(a – 14) a = 7
5. 4n – 3 n = -3