Question

Which equation represents a line which is parallel to y=0?A. y=xB. y=x−4C. y=-7D. x=−1

Answer 1

Recall that the equation of a horizontal line has the form:

$\begin{gathered} y=k, \\ \text{where k constant is a real number.} \end{gathered}$

Since the given equation is:

$y=0,$

then it is the equation of a horizontal line.

Now, the lines parallel to a horizontal line must be horizontal lines too, therefore, the equation that represents a line that is parallel to y=0 is:

$y=-7.$

Answer: Option C.