Equation of a Straight Line Parallel to Axes

Q. If the line $(3x+14y+7)+k(5x+7y+6)=0$
is parallel to the y-axis, then find the value of $k$.$\left[2Marks\right]$

Q.

If the line
$(3x+14y+7)+k(5x+7y+6)=0$
is parallel to the y-axis, then the value of $k$ is

1. $\frac{1}{3}$
2. $\frac{-3}{5}$
3. $-2$
4. $2$