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Algebra: Variables and Expressions
Chapter 1 Lesson 4 Algebra: Variables and Expressions Objective: Evaluate simple algebraic expressions.
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A branch of mathematics that involves expressions with variables.
Algebra A branch of mathematics that involves expressions with variables.
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Algebraic Expression A sentence that contains variables, numbers, and at least one operation. Example: n + 2
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Usually a letter or a symbol to represent a number
Variable A place holder Usually a letter or a symbol to represent a number X + 6 = 7
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The number that is next to the variable.
Coefficient The number that is next to the variable. 8x + y +3
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The term that does not contain a variable.
Constant The number The term that does not contain a variable. 8x + y +3
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Equation A mathematical sentence that contains an equal sign.
They can be either true or false Example = 21 = 25
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Solution A number that makes a sentence true.
Which of the following numbers is a solution to y + 8 = 12. 3, 4, or 5.
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Evaluate the expression
to solve the problem
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Evaluate the expression
N + 3 if N = 4 7
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Evaluate each expression if c = 8
10 C – 3 5 15 – C 7 C + 10 18
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The following symbols are used for multiplication with variables.
6d means 6 d 9st means 9 s t
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The following symbols are used for division with variables.
C D 7 K M 56 Means C ÷ D Means 7 ÷ K Means M ÷ 56
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Evaluate each expression
8w - 2w if w = 5 and v = 3
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Evaluate each expression
6 If n = 12
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Evaluate each expression
mn 6 if m = 8 and n = 12 2 y if y = 3
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Evaluate each expression if d = 8, e = 3, f = 4 and g = 1
7e + 2d 6. d 2 2
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Evaluate each expression if d = 8, e = 3, f = 4 and g = 1
2 6f 2f g 7e + 5 (5 + g) 2 2 2 2
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