Direct Variation Practice
Flashcard
•
Mathematics
•
8th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is direct variation?
Back
Direct variation is a relationship between two variables where one variable is a constant multiple of the other. It can be expressed as y = kx, where k is a non-zero constant.
2.
FLASHCARD QUESTION
Front
What does 'k' represent in the equation y = kx?
Back
In the equation y = kx, 'k' represents the constant of proportionality, which indicates how much y changes for a unit change in x.
3.
FLASHCARD QUESTION
Front
If y = 7/3x, what is the value of y when x = 9?
Back
y = 7/3 * 9 = 21.
4.
FLASHCARD QUESTION
Front
If y = 39 when x = 3, what is the constant of proportionality (k)?
Back
k = y/x = 39/3 = 13.
5.
FLASHCARD QUESTION
Front
What is the equation of direct variation if y = 26 when x = 2?
Back
y = 13x.
6.
FLASHCARD QUESTION
Front
Is the relationship y = 5x + 2 a direct variation?
Back
No, because it includes a constant term (2) that does not vary with x.
7.
FLASHCARD QUESTION
Front
If y varies directly with x and y = 20 when x = 4, what is y when x = 10?
Back
y = 50.
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