Answer:
the slope is -3/5
Explanation:
rewrite in the form y=mx+b = y=(-3/5)x+12/5
the slope of a line is m (the coefficient of x in this equation)
m=(-3/5)
the slope of a line parallel to 3x+5y=12 would be any line with -3/5 as the coefficient to x when x is to the power of one.
You can use any number in place of b except 12 (because if 12 is used, the line would not be parallel and your equation would be equal to what you started with)
examples of parallel lines:
y=(-3/5)x
y=(-3/5)x+1
y=(-3/5)x-3