Answer:

(y2-y1)/(x2-x1)

Given

(x1,y1)(x2,y2) = (9, 0)(3, y)

m = -1/2

Plug in the values in the equation, we have

m=(y2-y1)/(x2-x1)

-1/2=(y-0)/(3-9)

-1/2=y/-6

(-1/2)*(-6)=y

6/2=y

Step-by-step explanation:

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