4.6 & 4.7 Review

True or False: Direct Variations always pass through the origin (0, 0).

• True

• False

True or False: The Constant of Variation is represented by the letter x.

y = ax.

• True

• False

Tags

CCSS.HSF-LE.A.1B

Tell whether the equation represents direct variation. If so, identify the constant of variation.

y = -9x

• No, this is not a direct variation.

• Yes, this is a direct variation. The constant of variation is -9.

• Yes, this is a direct variation. The constant of variation is 9.

Tell whether the equation represents direct variation. If so, identify the constant of variation.

-4y = 8x

• No, this is not a direct variation.

• Yes, this is a direct variation. The constant of variation is 2.

• Yes, this is a direct variation. The constant of variation is -2.

Tell whether the equation represents direct variation. If so, identify the constant of variation.

3x = -y + 3

• No, this is not a direct variation.

• Yes, this is a direct variation. The constant of variation is 3.

• Yes, this is a direct variation. The constant of variation is -3.

Given that y varies directly with x, use the specified values to write a direct variation equation that relates x and y.

x = -3, y = 18

• y = -6x

• y = 6x

• y = -3x

• y = 18x

Given that y varies directly with x, use the specified values to write a direct variation equation that relates x and y.

x = 6, y = -42

• y = 7x

• y = -7x

• y = 6x

• y = -42x

Given that y varies directly with x, and y = 24 when x = 3, what is it when x = -6?

y = ax

• 8

• -48

• 48

Given that y varies directly with x, and y = -16 when x = -4, what is it when x = 3?

y = ax

• 4

• 16

• 12

Evaluate the function when x = -2.

f(x) = 15x - 4

• -34

• 26

• -26

• 34

Tags

CCSS.HSF.IF.A.2