Respuesta :

slope = Δy ÷ Δx

y₂-y₁
---------
x₂-x₁

5-1
------- =
-3-1

4
----
-4


slope = -1


y-y₁ = m (x-x₁)

y-1 = -1 (x-1)

y-1 = -x + 1

y = -x + 1 + 1

y = -x + 2