Write variable expressions
key notes :
Understanding Variables: Variables are symbols used to represent unknown or changing quantities in mathematical expressions.
Components of Expressions: Expressions consist of variables, constants (fixed values), and mathematical operations (like addition, subtraction, multiplication, and division).
Examples:
- Simple Expressions: x+5, where xxx is a variable.
- More Complex Expressions: 3y−2, where yyy is another variable.
Identifying Keywords: Keywords such as “more than,” “less than,” “twice,” “sum,” “difference,” “product,” and “quotient” indicate specific operations in expressions.
Translating Phrases into Expressions: Practice translating verbal descriptions into algebraic expressions. For example:
- “Twice a number increased by 7” translates to 2x+7, where xxx is the number.
Evaluating Expressions: Substitute values for variables to find the value of the expression. For 2x+52, if x=3, then 2(3)+5=11.
Word Problems: Solve word problems by setting up and simplifying algebraic expressions based on given conditions.
Learn with an example
⌛ Write an expression for j subtracted from 85. _______
- “j subtracted from 85″ means you should subtract j from 85.
85 − j
⌛ Write an expression for 38 minus r._____
- “38 minus r” means you should subtract r from 38.
- 38 − r
⌛ Write an expression for g reduced by 202. _____
- “g reduced by 202″ means you should subtract 202 from g.
- g − 202
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