What is the slope of any parallel line to the line 8x + 9y = 3 in the standard (x, y) coordinate plane?

The slope of a line present in the form:

ax + by = c

is given by:

-a/b

Moreover, whenever two lines are parallel, they have the same slope. So, if any line is to be parallel to the given line, it must have the same slope as this line, which is:

- (8) / (9)

-8/9