Q2 Sum Review: Part 2

Flashcard
•
Mathematics
•
9th - 12th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What does it mean for y to vary directly with x?
Back
It means that y is proportional to x, which can be expressed as y = kx, where k is a constant.
2.
FLASHCARD QUESTION
Front
If y = 16 when x = 32, what is the constant of variation (k)?
Back
k = \frac{y}{x} = \frac{16}{32} = \frac{1}{2}.
3.
FLASHCARD QUESTION
Front
What is the equation representing the direct variation when y = 16 and x = 32?
Back
y = \frac{1}{2}x.
4.
FLASHCARD QUESTION
Front
How do you determine if a relation is a function?
Back
A relation is a function if each input (x-value) has exactly one output (y-value).
5.
FLASHCARD QUESTION
Front
What is the solution to the equation - (4n + 7) = 2(n - 20)?
Back
n = 5.5.
6.
FLASHCARD QUESTION
Front
What is the equivalent expression for -9(5c + 4)?
Back
-45c - 36.
7.
FLASHCARD QUESTION
Front
What is the formula for direct variation?
Back
y = kx, where k is the constant of variation.
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