Direct Variation

Front

What does the Direct Variation Equation look like?

Back

Y = kx

Front

If y varies directly as x, and y = 4 when x = 3, what is x when y = -12?

Back

-9

Front

Which equation represents a direct variation?

Back

y = -2x

Front

In a direct variation, if y = 39 when x = 3, what is the value of y when x = 2?

Back

26

Front

If y = 4 when x = -4, what is y when x = 7?

Back

y = -x; -7

Front

Define direct variation.

Back

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

Front

What is the constant of variation in the equation y = kx?

Back

The constant of variation (k) is the ratio of y to x.

Front

If k = 5 in the equation y = kx, what is y when x = 2?

Back

y = 10

Front

If y varies directly with x and y = 10 when x = 2, what is the value of k?

Back

k = 5

Front

How do you determine if a relationship is a direct variation?

Back

Check if the ratio y/x is constant for all pairs of (x, y).