What is the value of p?

Question

slope=-2

(8,7) (7,p)

 

Answer 1

Apply the definition of slope.

 

m = (y₂ - y₁)/(x₂ - x₁)

 

m = -2

y₂ = p

y₁ = 7

x₂ = 7

x₁ = 8

 

-2 = (p - 7)/(7 - 8)

 

-2 = 7 - p

 

p = 9

 

Test the answer.

Answer 2

use the formula for slope (m):  -2 = (p-7) / (7-8).

now solve for p.