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1=7 3=21 5=35 7=49 13=91 hope this helps :)
Formula for point-slope:

Plug in the values:
And there you have your answer in point-slope form
2/9 then 1/4 and then 4/12
-1/2 I think is the slope
What are you asking, I can help you if you give more context on what your asking.