Thats the same thing as 0.3 x 10
when mulitplying by 10, 100, 1000, etc.
what i do is i move the decimal place over how many zeros there are so there is one zero and that means you need to move the decimal place over one space to the right so the answer is
3
Point slope form
y - y1 = m(x - x1)
Plug in the given
slope = -4
Point ( 4, 1)
y - 1 = -4(x - 4)
y - 1 = -4x +16
add 1 to both sides
y = -4x + 17
Hope this helps!