Set 9: Linear Functions (Intermediate)

Choice A is correct. Choice A is the correct answer. Horizontal lines have the form $y = k$. 1. Identify: A horizontal line has a slope of 0 and passes through all points with the same y-coordinate. 2. Select: The y-coordinate of the point $(4, -2)$ is $-2$. 3. Equation: $y = -2$. Strategic Tip: Horizontal lines have 0 slope and are y= equations (HOY). Vertical lines have Undefined slope and are x= equations (VUX). Choice B is incorrect because $x=4$ is a vertical line. Choice C is incorrect because it uses the x-coordinate for a y-equation. Choice D is incorrect because it uses the y-coordinate for an x-equation.