Question

u5:04: unit 5 test
which of the following equations represents a horizontal line? select all that apply.
$x=-1$
$f(x)=-7$
$x=9$
$y=8$
$y=-2$

Explanation:

Horizontal lines on a coordinate plane have equations where the y-value (or function output) is constant, with no dependence on x. Equations of the form $x = c$ are vertical lines, not horizontal.

Answer:

• B. $f(x) = -7$
• D. $y = 8$
• E. $y = -2$