Question

Which word describes the slope of the line? positive negative zero undefined

Answer 1

Negative! 1st and 4th box is negative.

Answer 2

If the the line goes from quadrant 2 to quadrant 4 then the slope would be negative
 to find the slope you take 
Δy÷Δx    .... this just means the change in y over the change in x

for example
 if i had points  A (-2,3) B( 4,-5)

I take the y points and subtract them from one another
and i then take the x coordinates and subtract them, take the end result and divide y over x

 3-(-5) / -2-4 
8/-6 
4/-3

 And since the final slope is negative therefore the line is going downwards and is negative