Question

The line $ax+by+c=0,$ is parallel to $x$ axis when $a$ = .

• A. $2$
• B. $1$
• C. $0$

Answer 1

The correct option is C $0$

If $a=0$ in the equation $ax+by+c=0,$
then, $\left(0\right)x+by+c=0\Rightarrow by+c=0\Rightarrow y=\frac{-c}{b}$

Here, $y$ is a constant.
Hence, the line is parallel to the $x$-axis.