Question

Point (-5,-4) m=undefined into y-y1=m(x-x1) and then into standard form y=mx+b

Answer 1

(-5,-4)=(x,y)
so
y-(-5)=m(x-(-4))
y+5=m(x+4)

Answer 2

and then how would that go into standard form?

Answer 3

You plug the points you have into the equation
-4=m(-5)+b