Geometrymedium · Past Paper
If the lines y = m1x + c1 and y = m2x + c2 are coincident, then:
Am1 = m2 and c1 = c2
Bm1 = m2 and c1 != c2
Cm1*m2 = -1
Dm1*m2 = 1
✓ Correct Answer: A — m1 = m2 and c1 = c2
Coincident lines are identical, meaning both their slopes and y-intercepts must be equal.
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