looks like cphill has alr answered 1 and 2. :))
3.
You want to start with finding the slope, "m".
(5--4)/(-3-0) = 9/-3 = -3.
Then we can pllug one of the points in.
y = -3x+b
5 = -3(-3) + b
b = -4
y = -3x-4
4.
For this one, we just need the slope.
(-7--1)/(4--5) = -6/9 = -2/3
A perpendicular slope is oposite.
Take the negative and recipical. 3/2
5.
1/3 + n/7 < 1
n/7 < 2/3
n < 14/3
n = 4
I hope this helped. :)))
=^._.^=