Question

I need help understanding this problem

Answer 1

Y - y1 = m(x - x1)

first find the slope (y2 - y1)/(x2 - x1)
(-3 - -1)/(3 - -4) = -2/7 = -2/7
y - -1 = -2/7(x - -4)
y + 1 = -2/7(x + 4)

Answer 2

Point slope eqaution is
y-y1=m(x-x1)---------equation1

find m slope=y2-y1/x2-x1
m=-3+1/3+4=-2/7

so put those all values in eqaution 1 
(x1, y1) as (-4, -1).
y+1= - 2/7(x+4)