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Verifying that Two Slanted Lines are Parallel from their Graphs

To verify if two slanted lines graphed on a coordinate plane are parallel, one can use the graph to confirm they share the same slope but have different yy-intercepts. For example, consider a graph showing two slanted lines: the first passes through (0,3)(0, 3) and (5,5)(5, 5), and the second passes through (0,2)(0, -2) and (5,0)(5, 0). By counting the rise and run for the first line from (0,3)(0, 3) to (5,5)(5, 5), the rise is 22 and the run is 55, resulting in a slope of m = rac{2}{5}. This first line crosses the yy-axis at (0,3)(0, 3). For the second line, moving from (0,2)(0, -2) to (5,0)(5, 0), the rise is also 22 and the run is 55, giving a slope of m = rac{2}{5}. This second line crosses the yy-axis at (0,2)(0, -2). Because both lines have the identical slope of rac{2}{5} but different yy-intercepts (33 vs. 2-2), they are verified to be parallel lines.

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Updated 2026-05-03

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