Question

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

• A. $2$
• B. $0$
• C. $1$

Answer 1

The correct option is B $0$

Put $a=0$ in $ax+by+c=0.$
$\Rightarrow 0.x+by+c=0$
​$\Rightarrow y=\frac{-c}{b}$
$y$ is a constant. Hence, the line is parallel to the $x$-axis.