Can someone explain to me on how to find slope on line of fit? (i don't have a problem or worksheet to explain, line of fit is my struggle in math xd)

You need to know two points on your line, in order to find the slope.

If you're given the y intercept, that is one point, (0,a) where a is the y intercept.

If you're given the x intercept, that's another point, (c,0) where c is the x intercept.

You could also be given points on the line that aren't an x or y intercept. Let's call these points (r,s) and (j,k).

To find the slope of the line, you need just two points. Take the difference of the y coordinates, and divide by the difference of the x coordinates to solve for the slope.

Using our two generic points (r,s) and (j,k), we would solve for the slope m as follows:

m = (s-k) ÷ (r-j)

Hope that helped!

Um...
Okay, there is another easy steps to do:)
First, you have to pick two line on the graph for example:
(7,8) and (3,4). Then, we just applied to the formula if finding the slope which is:
m=(y2-y1)/(x2-x1) where m is the slope
y2=4
y1=8
x2=3
x1=7
Apply to that same step to get:
m=(4-8)/(3-7)
m=-4/-4
m=1. Hope it help!