Hello, hope you are having a marvellous day.
First, we should check if the equation is written in slope-intercept form (y=mx+b)
If it is, then it's easy to find the slope, as in slope-intercept equations the slope is the number before x.
As we can see, our equation is written in slope-intercept form.
So the slope is the number before x, or in this case, -4.
Hope it helps. Ask me if you have any queries.
~An emotional teen who helps others with joy
Good luck.