Using substitution to evaluate expressions

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•
Mathematics
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is substitution in algebra?
Back
Substitution in algebra is the process of replacing a variable with a specific value or another expression to evaluate or simplify an expression.
2.
FLASHCARD QUESTION
Front
How do you distribute in an expression like 4(2x + 10y)?
Back
To distribute, multiply each term inside the parentheses by the factor outside. For example, 4(2x + 10y) becomes 4*2x + 4*10y, which simplifies to 8x + 40y.
3.
FLASHCARD QUESTION
Front
What is the equivalent expression for 4(2x + 10y)?
Back
The equivalent expression is 8(x + 5y).
4.
FLASHCARD QUESTION
Front
How do you evaluate an expression like 7y - 3y for y=2?
Back
Substitute 2 for y in the expression: 7(2) - 3(2) = 14 - 6 = 8.
5.
FLASHCARD QUESTION
Front
What is the value of the expression 6h + 30 when h = 6?
Back
Substituting h = 6 gives 6(6) + 30 = 36 + 30 = 66.
6.
FLASHCARD QUESTION
Front
How do you evaluate the expression 4g + 2h + 4 if g = 3 and h = 9?
Back
Substituting g = 3 and h = 9 gives 4(3) + 2(9) + 4 = 12 + 18 + 4 = 34.
7.
FLASHCARD QUESTION
Front
What is the result of evaluating 4y when y = 3?
Back
Substituting y = 3 gives 4(3) = 12.
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