Geometrymedium · Past Paper
If the lines 2x + ky + 3 = 0 and 4x + 6y + 9 = 0 are parallel, then k is:
A2
B3
C4
D6
✓ Correct Answer: B — 3
For parallel lines, coefficients of x and y are proportional: 2/4 = k/6 => 1/2 = k/6 => k = 3.
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