Respuesta :

Answer:

 y=1/2+1

Step-by-step explanation:

1) Y2-Y1 over X2-X1

9-5=4

12-4=8

4/8 simplify the answer= 1/2

m=1/2

2) subtitute the simplification to one of the points.

y=mx+b

5=1(4)+b

5=4=b

1=b

y=1/2+1