What are the "tools" we use to write proofs?

Which equation could represent the relationship shown in the scatter plot? y=−3x−2 y=−3/4x+10 y=−2/3x+1 y=9x−12 scatter plot with x axis labeled variable x and y axis labeled variable y. points go from upper left to lower right.

Three runners competed in a race data were collected at each mile mark for each runner if the runner ran at a constant pace the data would be linear

What is y-5=3(x+1) in slope intercept form