The Slope-Intercept form of the equation of a line is:

Where "m" is the slope of the line and "b" is the y-intercept.
In this case you have this equation:

You can write it in Slope-Intercept form by solving for "y":

You can identify that:

In order to find which equation is parallel to the given line, you need to identify that line whose slope is:

And whose y-intercept is:

Based on the above, you can determine that this line is the parallel one:

The answer is: Option a.