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.
Share this question
More from Geometry
- If the ratio of interior angle to exterior angle of a regular polygon is 5:1, find the number of sides.
- The length of the arc of a semicircle with radius 'r' is:
- What is the slope of the line perpendicular to the line x - 2y + 3 = 0?
- The acute angle between the lines with slopes m1 and m2 is given by tan(θ) = :
- Find the equation of the line whose x-intercept is 3 and y-intercept is 4.