Question

the line through the point (-2,a)and(9,3)has slope -1/2.find the value of a
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Answer 1

Step-by-step explanation:

y₂-y₁

slope = ----------

x₂-x₁

3-a

slope = ----------

9-(-2)

3-a

-1/2 = -------

11

-11/2 = 3-a

a = 3+11/2

a = 17/2