Direct Variation Flashcard

Front

If x is directly proportional to y, and x = 32 when y = 16, what is x when y = 9?

Back

18

Front

What is the slope of a direct variation equation?

Back

Constant of proportionality

Front

If y varies directly with x and y = 10 when x = 5, what is the value of x when y = 20?

Back

10

Front

If y varies directly with x and y = 8 when x = 4, what is the constant of variation?

Back

2

Front

Does the following graph represent a direct variation relationship? (Make sure to read the reason to pick the best answer.)

Back

No. Even though it is a straight line, it does not go through the origin.

Front

Define direct variation.

Back

A relationship between two variables where one variable is a constant multiple of the other.

Front

What is the formula for direct variation?

Back

y = kx, where k is the constant of variation.

Front

What does the constant of variation represent in a direct variation equation?

Back

It represents the ratio of y to x, and it is the slope of the line.

Front

If k = 3 in the equation y = kx, what is y when x = 4?

Back

12

Front

If y = 15 when x = 3, what is the constant of variation?

Back

5