Question

Mark (✓) against the correct answer in each of the following:
Which of the following equations represents a line parallel to the x-axis?
(a) x + y = 5
(b) 2x + 5 = 8
(c) 2y − 4 = 1
(d) x + 4 = 0

Answer 1

(c) 2y − 4 = 1

$$\begin{gathered} 2y-4=1 \\ \Rightarrow 2y=4+1 \\ \Rightarrow 2y=5 \\ \Rightarrow y=2.5 \end{gathered}$$
A linear equation that contains only the y variable is parallel to the x-axis.