Given:  Prove:  Statements Reasons 1. given 2. ? 3. distance from to equals the distance from to definition of parallel lines 4. application of the distance formula 5. substitution property of equality 6. inverse property of addition 7. substitution property of equality The table shows the proof of the relationship between the slopes of two parallel lines. What is the missing reason for step 2? A. application of the distance formula B. application of the slope formula C. transitive property D. Pythagorean theorem