Question 1077947: Slope=-1/3 and f(9)=2 use the given conditions to write a function in the form f(x)=mx+b
Answer by rapture(86)   (Show Source):
You can put this solution on YOUR website!
Let m = slope
So, m = -1/3
Let f(x) = y
When x = 9, y = 2 or simply the point (9, 2).
We have enough information to find b.
2 = (-1/3)9 + b
2 = -3 + b
2 + 3 = b
5 = b
We can now write the needed function.
Answer: f(x) = (-1/3)x + 5
We can also write the answer as
f(x) = (-x/3) + 5
Either way is correct.
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