Question

state whether the slope of a line passing through (2, -3) and (1, 8) is positive, negative, zero or undefined.

Answer 1

Slope = change in y / change in x
 
          = (8 - -3) / (1 - 2)    =   (8 + 3) / ( 1 - 2)
 
          =   11 / -1
    
          = -11

Slope is negative.