You’re B’ coordinate would be (3,-2) the way I got this was x is zero so x would not move left nor right. The only way you would go is down because you have a negative six so you would move down 6 spaces
Point slope is y-y1= m(x-x1) where m is slope
Plug the values in:
y-(-8)=3(x-8)
Simplify:
y+8=3(x-8)
1/2 - 1/4 = 2/4 - 1/4 = 1/4
I hope this helps!