Ok so im a junior in high school and last year i failed geometry i don't want to be on the same path this year ETC...

Im doing slope stuff and i got different questions about this.

i understand that the equation is Y=Mx(slope)+B(Y,Intercept)

First question , When They give me For example

Point A (X1,Y1) point B (X2,Y2) i also know i have to do either Y1-Y2/X1-X2

I also heard i can do Y2-Y1/X2-X1 is this truth? cause Y2-Y1 is the form i use

when doing the equation i have problems because I get confuse With Y, and Y-intercept if for example i chose point B, (X2,Y2) X2 is going to be X? for multiplying the slope and Y2 is going to be The (Y=) ? or (Y-intercept).

Another thing i got a problem which is very confusing says Line S has equation Y=-1/3X-1. Line T is parallel to line S andpasses through pont (3,2). write an equation for line T. how can i do this? is it just going to be fliping it and making the slope (-1/3x) which is a fraction. Positive? Like making it (3/1x)?