What is the value of p such that the line passing through (9,-1) and (6,p) has a slope of -1?

p=-4

Step-by-step explanation:

slope= rise/run

(-1-p)/(6-9)=-1

(-1-p)/(-3)=-1

-1-p=3

-p=4

p=-4

3

step-by-step explanation:

because where the point where the 2 lines intersect is (3,-1) the x value is 3