If the lines `3x+by-1=0` and `ax-5y+2=0` are parallel, then find the relation between `a` and `b`.

Explanation

To find the relation between \( a \) and \( b \) for the lines \( 3x + by - 1 = 0 \) and \( ax - 5y + 2 = 0 \) to be parallel, we need to equate their slopes.

### Step-by-Step Solution:

1. **Write the equations of the lines in slope-intercept form (y = mx + c)**:
- For the first line \( 3x + by - 1 = 0 \):
\[
by = -3x + 1
...