The statement that completes step 4 in the given proof is: B. JK lies on line f and has a slope of 3.
<h3>What is the Slope of a Line?</h3>
Slope of a line = rise/run or change in y / change in x.
In the graph given, JK lies on line f, find the slope:
Slope of JK = rise/run = 3 units / 1 unit
Slope of JK = 3
Therefore, the statement that completes step 4 is: B. JK lies on line f and has a slope of 3.
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