Respuesta :

Answer:

6

Step-by-step explanation:

(1-0)/(9-7)

m = 1/2

y = 1/2x + b

1 = 1/2(9) + b

1 = 4.5 + b

-3.5 = b

y = 1/2x - 3.5

k = 1/2(19) - 3.5

k = 9.5 - 3.5

k = 6