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. $\begin{array}{lllll}\text { relation } & \text { line } & \text { function } & \text { standard } & \text { parallel } \\\text { slope-intercept } & \mathrm{x} & \mathrm{y} & \text { range } & \text { domain } \\\text { point-slope } & \text { perpendicular } & \text { linear inequalityslope } & \text { linear function }\end{array}$

-Two lines are if the product of their slopes is -1.

A) relation
B) parallel
C) function
D) perpendicular