SOLUTION: 13 - 51 15 - 49 22 - 42 33 - 31 36 - 28 Input / output .. I need the Rule here thanks I am stuck

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Question 390372: 13 - 51
15 - 49
22 - 42
33 - 31
36 - 28
Input / output .. I need the Rule here thanks I am stuck

Found 2 solutions by jerryguo41, stanbon:
Answer by jerryguo41(197) (Show Source):
You can put this solution on YOUR website!
13 - 51
(+2)-(-2)
15 - 49
(+7)-(-7)
22 - 42
Starting at 1 - 63 you can add to input the same amount as you subtract from output.

Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
13 - 51
15 - 49
22 - 42
33 - 31
36 - 28
Input / output .. I need the Rule here thanks
----------------
The relation is linear.
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Use two of the pairs to find the slope:
m = (49-51)/(15-13) = -1
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Form: y = mx + b
Substitute for y,x and m, then solve for "b":
51 = -1(13)+b
b = 64
-------
Equation:
y = -x+64
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Cheers,
stan H.