College Math CLEP Prep Practice Exam

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What type of line in a coordinate plane has a slope of zero?

Vertical
Horizontal
Rectilinear
Diagonal

The correct answer is: Horizontal

A vertical line in a coordinate plane has an undefined slope, as it is not possible to divide by zero. A rectilinear line is a term used to describe a line made up of straight segments, but does not specify the slope of the line. A diagonal line would have a non-zero slope, except for a line going through the origin. A horizontal line is parallel to the x-axis and has a slope of zero, meaning that it does not rise or fall as it moves along the x-axis. Therefore, the correct answer is B Horizontal.