Parallel, perpendicular and intersecting lines
Two-dimensional geometry · Mathematics
Study notes
Q: Classify pairs: (a) y=2x+1, y=2x−5 (b) y=2x+1, y=−x/2+3 (c) find intersection of y=x+1 and y=−x+5. (a) Same slope: parallel. (b) 2×(−1/2) = −1: perpendicular. (c) x+1 = −x+5: x = 2, y = 3. Meet at (2,3).