Geometryeasy · Past Paper
If the slope of two lines are m1 and m2, what is the condition for them to be parallel?
Am1 * m2 = -1
Bm1 = m2
Cm1 + m2 = 0
Dm1 = -m2
✓ Correct Answer: B — m1 = m2
Parallel lines have the same steepness, so their slopes must be equal (m1 = m2).
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