Direct Variation Review

No - the line does not pass through the origin

Does the relationship represent a direct variation?

No - there is not a constant of variation

Does the relationship represent a direct variation?

Yes - the constant of variation is 30.

Does the relationship represent a direct variation?

Yes - the line passes through the origin

Does the relationship represent a direct variation?

yes - the constant of variation is 3/2.

Does the relationship represent a direct variation?

y = 2x + 1, no - the y-intercept is not zero

Solve the equation for y and determine if the relationship is a direct variation. -6x - 24 = -3(y + 7)

y = 4x, yes - the constant of variation is 4

Solve the equation for y and determine if the relationship is a direct variation. 2(y + 8) - 4 = 8x + 12

(0,0)

What ordered pair does the graph of a direct variation always pass through?

-35

x and y vary directly. If y = -15 when x = 3, find the value of y when x = 7

35

x and y vary directly. If y = 30 when x = 6, find the value of y when x = 7

24

x and y vary directly. If y = 30 when x = 90, find the value of y when x = 72

6

x and y vary directly. If y = 4 when x = 8, find the value of y when x = 12

yes - the constant of variation is 20

A local gym costs $20 per month to use the gym. Does the total cost vary directly with the number of months?