Question 255090
The only time a slope doesn't exist is if the equation is x= a number such as x=3. Then the slope is undefined. It is a vertical line.
If the equation is something like y=a number such as y=3 then the slope is 0 . It is a horizontal line.
In your case the equation is in the form y=mx+b where m is the slope -3
which means it slants down from top right to bottom left.