Fill in the Blank with One of the Words or Phrases

Multiple Choice

Fill in the blank with one of the words or phrases listed below. $$\begin{array} { l l l } \text { slope-intercept } & \text { directly } & \text { slope } \\\text { jointly } & \text { parallel } & \text { perpendicular } \\\text { function } & \text { inversely } & \text { linear function }\end{array}$$
-In the equation y = kxz, y varies -----------as x and z.

A) jointly
B) directly
C) parallel
D) inversely