Definition: Parallel lines are lines in the same plane that never intersect and stay the same distance apart. On a coordinate plane, parallel lines have the same slope.
Example: Identify the pair of parallel lines:
We know parallel lines never continue forever without intersecting. Using this information we can identify which pair of lines is parallel.
Step 1: Compare the given pairs of lines.
Step 2: Since pairs 2, 3 & 4 intersect or will intersect when extended in both directions, we can determine pair 1 to be the best answer.
Option 1 best fits our definition of parallel lines.
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