Select the correct answer. Given: r ∥ s. Prove: m r = m s. Two parallel lines passing the vertices with red line r at points (c, d) at (2, 10) and (0, b) at (0, 6) and blue line s intercepts (c, 0) at (2, 0) and (0, a) at (0, -4). Statements: Reasons: 1. r ∥ s (given). 2. m r = (d - b) / (c - 0) = (d - b) / c, m s = (0 - a) / (c - 0) = -a / c (application of the slope formula). 3. Distance from (0, b) to (0, a) equals the distance from (c, d) to (c, 0) (definition of parallel lines). 4. d - 0 = b - a (application of the distance formula). 5. m r = (b - a) - b / c (substitution property of equality). 6. m r = a / c (inverse property of addition). 7. m r = m s (substitution property of equality). Which step of the proof contains an error?
1) Step 6
2) Step 4
3) Step 5
4) Step 2
