Which expression can be used to determine the slope of the line that passes through the points (–7, 3) and (1, –9)?

Question

i just need the answer please help me.

Answer 1

Slope between (x₁, y₁), (x₂, y₂) is found by:

m = (y₂-y₁)/(x₂-x₁)

 

(-7,3), (1,-9)

 

m = (-9-3)/(1-(-7)) = -12/8  = -3/2

or

m = (3-(-9))/(-7-1) = 12/(-8) = -3/2

 

As you can see, it doesn't matter which you 

consider the first point and which the second

so long as you are consistent with it.

Answer 2

m = (3 - (-9)) / (-7 - 1)