Download 1.3 Algebraic Expressions Expression: a combination of variables

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1.3 Algebraic Expressions
Expression: a combination of variables,
numbers and operations (NO EQUALS)
Ex: 5x + 867y
Equation: An expression that contains an
equals
Ex: 4x + 5 = 21
Operation
+
*
Words
plus, add, addition,
sum, more than, total
minus, less than,
subtraction, take away,
difference
multiplication, multiply,
times, product
divided by, quotient
/
**Less than: do it in reverse order!
Five less than a number b
b-5
1
Write the algebraic expression:
1. 15 less than the product of 3 and a
number y
2. The sum of the product of 5 and x, and 7
You try:
Page 22 (10 - 15)
2
Substitution
Steps:
1. Rewrite expression with given numbers
**use () with substituting
2. Plug it into the calculator (or do by hand)
Examples:
1. 4x + 5y3 - 13; x = 4 and y = -2
2. -a2 + 4b - ab ;a = -5 and b = 14
-8a
3
You try:
Page 23 (39 - 44)
Assignment:
4
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