Geometryeasy · Past Paper
Condition for the lines y = m1x + c1 and y = m2x + c2 to be parallel is:
Am1 = m2
Bm1 * m2 = -1
Cm1 = -m2
Dc1 = c2
✓ Correct Answer: A — m1 = m2
Parallel lines must have identical slopes.
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