Option (C) definition of slope is the missing reason for the 2nd step in the proof is the correct answer.
What is slope of a line?
The slope or gradient of a line is a number that describes both the direction X and Y and the steepness of the line. It is the ratio of the vertical change to the horizontal change between any two distinct points on a line.
For the given situation,
The table shows some statements and reason for that statements.
For second statement, the reason is missing.
The statement is the slope of AB is [tex]\frac{y1}{x}[/tex] and the slope of CD is [tex]\frac{y2}{x}[/tex]
The reason for this is that it is the definition of slope.
Hence we can conclude that option (C) definition of slope is the missing reason for the 2nd step in the proof is the correct answer.
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