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Questions and Answers
Which expression is a two-variable expression?
Which expression is a two-variable expression?
- 2x + 11
- (2z + Y) – 5 (correct)
- |CY + Z – X|
- 2z - 5
What type of mathematical operation is represented in the expression |CY + Z – X|?
What type of mathematical operation is represented in the expression |CY + Z – X|?
- Multiplication and division
- Exponentiation
- Addition and subtraction
- Absolute value (correct)
Which expression includes a constant term?
Which expression includes a constant term?
- (2z + Y) – 5
- 2z + 5
- |CY + Z – X|
- 2x + 11 (correct)
Which of the following expressions contains three variables?
Which of the following expressions contains three variables?
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What is the result of simplifying (2z + Y) – 5 when Y = 3 and z = 4?
What is the result of simplifying (2z + Y) – 5 when Y = 3 and z = 4?
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Study Notes
Two-Variable Expression
- An expression with two variables is an algebraic expression that contains two different letters representing unknown values.
Mathematical Operation
- The expression |CY + Z – X| represents the absolute value.
- Absolute value refers to the distance of a number from zero on a number line, always a positive value.
Constant Term
- A constant term, in an expression, is a value that does not change, represented by a number, usually without any variables.
Three Variables
- An expression with three variables includes three different letters representing unknown values.
Simplifying Expression
- To simplify (2z + Y) – 5 when Y = 3 and z = 4, substitute the values of Y and z into the expression.
- (2 * 4 + 3) - 5
- After performing the calculations: 8 + 3 - 5 = 6
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